| Author |
Message |
Tim & Linda
Guest
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 Posted:
Thu Dec 01, 2005 8:38 am Post subject:
No heat |
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My daughter has a 1998 GMC Jimmy. It has climate control. She is getting no
heat even if the temp is turned all the way up. I check the coolant level
its fine. The engine temp gauge shows its up to operating temp. I felt the
hose's to the heater core and one was warm but not hot the other was cool.
Is there some kind of a flow switch that controls the water to the core, or
should I be looked at a blocked core. Core replacement sounds like difficult
job.
I need to get it fixed soon we are in Michigan and its not going to get any
warmer for a long time.
Thanks
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Silver Surfer
Guest
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| Posted:
Thu Dec 01, 2005 9:15 am Post subject:
Re: No heat |
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Temperature is controlled by the amount of air the system allows across the
heater core. No control on the coolant side. Your temperature observations
suggest low coolant flow through the heater core.
"Tim & Linda" <lt.stoops@askme.net> wrote in message
news:zNCdnU0U79a6_xPeRVn-jQ@comcast.com...
| Quote: | My daughter has a 1998 GMC Jimmy. It has climate control. She is getting
no heat even if the temp is turned all the way up. I check the coolant
level its fine. The engine temp gauge shows its up to operating temp. I
felt the hose's to the heater core and one was warm but not hot the other
was cool.
Is there some kind of a flow switch that controls the water to the core,
or should I be looked at a blocked core. Core replacement sounds like
difficult job.
I need to get it fixed soon we are in Michigan and its not going to get
any warmer for a long time.
Thanks
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| Back to top |
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Mark Sparge
Guest
|
| Posted:
Thu Dec 01, 2005 7:37 pm Post subject:
Re: No heat |
|
|
Tim & Linda wrote:
| Quote: | My daughter has a 1998 GMC Jimmy. It has climate control. She is getting no
heat even if the temp is turned all the way up. I check the coolant level
its fine. The engine temp gauge shows its up to operating temp. I felt the
hose's to the heater core and one was warm but not hot the other was cool.
Is there some kind of a flow switch that controls the water to the core, or
should I be looked at a blocked core. Core replacement sounds like difficult
job.
I need to get it fixed soon we are in Michigan and its not going to get any
warmer for a long time.
Thanks
-------------------------------------------------------------------------------------------------- |
Not sure about the '98 Jimmy, but older GM cars had a vacuum operated
flow control valve that was supposed to open when you "turned up the
temp".
Good Luck,
Mark
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Guest
|
| Posted:
Thu Dec 01, 2005 8:42 pm Post subject:
Re: No heat |
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| Quote: | one was warm but not hot the other was
cool.
|
meaning, coolant is not flowing through the core. The heater core is
just like the radiator, only in a mini-version. So, either there is a
faulty control valve(the T-stat is the 'control' for the radiator) or
the core is clogged with junk. I'd first suspect a faulty control in
the flow system to/through the core, if there is one. If that isn't the
case, then it's a problem with the core. Maybe you can 'back-flush' the
core with a water hose. Remove the hoses, put a garden hose on the core
hose connection that is the cold one. Turn on the hose.....at a slow
rate of flow....if there is not a flow control valve involved, and the
core isn't too badly clogged, water 'should' flow out of the connection
that was the warm hose. I'd have a length of hose on the other core
connection, to avoid getting the engine compartment wet if this flush
method works. If the flush works with this hose connection, reverse
them and make sure water flows both ways. Unfortunately, there can be
some bad news with the core even with if you get flow through the core.
If the core was clogged, whatever was stopping the flow, might also have
cause a break/hole in the tubing of the core...meaning it's a leaker! A
leaking core has only one fix.....replacment. Breathing the
chemical-laden air in the cabin is bad for the lungs. The 'life' of a
heater core is about 10yrs(give/take), depending on how well the cooling
system was maintained and the quality of the water used.
Hope some of this helps.....
Dave S(Texas) |
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Mark Sparge
Guest
|
| Posted:
Fri Dec 02, 2005 12:55 am Post subject:
Re: No heat |
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Mark Sparge wrote:
| Quote: | Tim & Linda wrote:
My daughter has a 1998 GMC Jimmy. It has climate control. She is getting no
heat even if the temp is turned all the way up. I check the coolant level
its fine. The engine temp gauge shows its up to operating temp. I felt the
hose's to the heater core and one was warm but not hot the other was cool.
Is there some kind of a flow switch that controls the water to the core, or
should I be looked at a blocked core. Core replacement sounds like difficult
job.
I need to get it fixed soon we are in Michigan and its not going to get any
warmer for a long time.
Thanks
--------------------------------------------------------------------------------------------------
Not sure about the '98 Jimmy, but older GM cars had a vacuum operated
flow control valve that was supposed to open when you "turned up the
temp".
Good Luck,
Mark
|
-------------------------------------------------------------------------------------------------------
Second thoughts on my previous post -- if you find that your vehicle
has a vacuum operated flow valve, check for the presence of vacuum
before you change anything.
HTH,
Mark |
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Tim & Linda
Guest
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| Posted:
Fri Dec 02, 2005 1:45 am Post subject:
Re: No heat |
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thanks for your ideas. I pulled the radiator cap today and found a slug on
it and in the rediator. I took it to a repair shop and they said someone had
put stop leak in. It was by the previous owner. Tomorrow it goes in for a
flush hope that will fix it.
"Mark Sparge" <markcronk@cox.net> wrote in message
news:1133463302.516945.32610@g47g2000cwa.googlegroups.com...
| Quote: |
Mark Sparge wrote:
Tim & Linda wrote:
My daughter has a 1998 GMC Jimmy. It has climate control. She is
getting no
heat even if the temp is turned all the way up. I check the coolant
level
its fine. The engine temp gauge shows its up to operating temp. I felt
the
hose's to the heater core and one was warm but not hot the other was
cool.
Is there some kind of a flow switch that controls the water to the
core, or
should I be looked at a blocked core. Core replacement sounds like
difficult
job.
I need to get it fixed soon we are in Michigan and its not going to get
any
warmer for a long time.
Thanks
--------------------------------------------------------------------------------------------------
Not sure about the '98 Jimmy, but older GM cars had a vacuum operated
flow control valve that was supposed to open when you "turned up the
temp".
Good Luck,
Mark
-------------------------------------------------------------------------------------------------------
Second thoughts on my previous post -- if you find that your vehicle
has a vacuum operated flow valve, check for the presence of vacuum
before you change anything.
HTH,
Mark
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Tim & Linda
Guest
|
| Posted:
Fri Dec 02, 2005 4:27 am Post subject:
Flushing system |
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|
Is it possible for me to get a good system flush? Or should I just spend the
$60 and take it to the shop?
"Tim & Linda" <lt.stoops@askme.net> wrote in message
news:zNCdnU0U79a6_xPeRVn-jQ@comcast.com...
| Quote: | My daughter has a 1998 GMC Jimmy. It has climate control. She is getting
no heat even if the temp is turned all the way up. I check the coolant
level its fine. The engine temp gauge shows its up to operating temp. I
felt the hose's to the heater core and one was warm but not hot the other
was cool.
Is there some kind of a flow switch that controls the water to the core,
or should I be looked at a blocked core. Core replacement sounds like
difficult job.
I need to get it fixed soon we are in Michigan and its not going to get
any warmer for a long time.
Thanks
|
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|
| Back to top |
|
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Hairy
Guest
|
| Posted:
Fri Dec 02, 2005 8:07 am Post subject:
Re: Flushing system |
|
|
"Tim & Linda" <lt.stoops@askme.net> wrote in message
news:8rWdnZgjvKZM5RLeRVn-qQ@comcast.com...
| Quote: | Is it possible for me to get a good system flush? Or should I just spend
the
$60 and take it to the shop?
|
It sounds like it needs a good flush. Unfortunately, that flush is liable to
expose the reason why the PO put stop leak in it. Maybe you'll get lucky.
Dave |
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JRL
Guest
|
| Posted:
Fri Dec 02, 2005 8:04 pm Post subject:
Re: No heat |
|
|
You should be able to do the same thing from the firewall side where
the hoses go in. No need to go near the core unless it is bad.
On Thu, 1 Dec 2005 08:42:25 -0600, putt@webtv.net wrote:
| Quote: | one was warm but not hot the other was
cool.
meaning, coolant is not flowing through the core. The heater core is
just like the radiator, only in a mini-version. So, either there is a
faulty control valve(the T-stat is the 'control' for the radiator) or
the core is clogged with junk. I'd first suspect a faulty control in
the flow system to/through the core, if there is one. If that isn't the
case, then it's a problem with the core. Maybe you can 'back-flush' the
core with a water hose. Remove the hoses, put a garden hose on the core
hose connection that is the cold one. Turn on the hose.....at a slow
rate of flow....if there is not a flow control valve involved, and the
core isn't too badly clogged, water 'should' flow out of the connection
that was the warm hose. I'd have a length of hose on the other core
connection, to avoid getting the engine compartment wet if this flush
method works. If the flush works with this hose connection, reverse
them and make sure water flows both ways. Unfortunately, there can be
some bad news with the core even with if you get flow through the core.
If the core was clogged, whatever was stopping the flow, might also have
cause a break/hole in the tubing of the core...meaning it's a leaker! A
leaking core has only one fix.....replacment. Breathing the
chemical-laden air in the cabin is bad for the lungs. The 'life' of a
heater core is about 10yrs(give/take), depending on how well the cooling
system was maintained and the quality of the water used.
Hope some of this helps.....
Dave S(Texas) |
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| Back to top |
|
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NickySantoro
Guest
|
| Posted:
Fri Dec 02, 2005 8:46 pm Post subject:
Re: Flushing system |
|
|
On Thu, 1 Dec 2005 17:27:27 -0500, "Tim & Linda" <lt.stoops@askme.net>
wrote:
| Quote: | Is it possible for me to get a good system flush? Or should I just spend the
$60 and take it to the shop?
"Tim & Linda" <lt.stoops@askme.net> wrote in message
news:zNCdnU0U79a6_xPeRVn-jQ@comcast.com...
My daughter has a 1998 GMC Jimmy. It has climate control. She is getting
no heat even if the temp is turned all the way up. I check the coolant
level its fine. The engine temp gauge shows its up to operating temp. I
felt the hose's to the heater core and one was warm but not hot the other
was cool.
Is there some kind of a flow switch that controls the water to the core,
or should I be looked at a blocked core. Core replacement sounds like
difficult job.
I need to get it fixed soon we are in Michigan and its not going to get
any warmer for a long time.
Thanks
You can probably just disconnect the two heater hoses and reverse |
flush it with a garden hose. I've done that a couple of times on
different cars and it's worked well. |
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Guest
|
| Posted:
Sat Dec 03, 2005 1:31 am Post subject:
Re: No heat |
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|
"Tim & Linda" <lt.stoops@askme.net> wrote in message
news:wIKdncSQ0M1JzxLenZ2dnUVZ_tidnZ2d@comcast.com...
| Quote: | thanks for your ideas. I pulled the radiator cap today and found a slug on
it and in the rediator. I took it to a repair shop and they said someone
had
put stop leak in. It was by the previous owner. Tomorrow it goes in for a
flush hope that will fix it.
|
Well, the previous owner put the stop leak in there for a reason...to avoid
fixing a leak, most likely. When you flush the radiator and engine, you
may well find your leak is back.
I developed a slow leak in my van soon after I acquired it (used). Turned
out it was corroded freeze plugs. When I pried the old ones out, found the
block FULL of putty-like gum. Had to dig it out, flush it, etc until I got
it
clean, and replaced the bad freeze plugs with new ones. |
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Guest
|
| Posted:
Sat Dec 03, 2005 1:36 am Post subject:
Re: Flushing system |
|
|
"Tim & Linda" <lt.stoops@askme.net> wrote in message
news:8rWdnZgjvKZM5RLeRVn-qQ@comcast.com...
| Quote: | Is it possible for me to get a good system flush? Or should I just spend
the
$60 and take it to the shop?
|
You can do a pretty fair job yourself. You might want to take off both
radiator
hoses, take out the thermostat, and flush with a garden hose. You can
usually
take off one end of the heater hose and flush through the core as well.
Then replace the radiator hoses and thermostat with new. (There is never a
better
or cheaper time to do it.)
Now, your original owner's leak may show up. It may be best to test the
system with
water alone until you are sure the heater is working and nothing is leaking.
I hate
to lose new antifreeze when I dont have to. |
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Tim & Linda
Guest
|
| Posted:
Sat Dec 03, 2005 2:01 am Post subject:
Re: Flushing system |
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|
I should of taken it to the shop. I went out and got a flush thing made by
Prestone to put in a heater hose. I got a new hose took the old one off and
put this flush thing in it. Then I turned on the hose let it run for about
10 minutes then I started the truck and let it run for another 10 minutes. I
got a bunch of junk out. Then we time to put it back together but I have to
drain the water out so I can put antifreeze in. The drain plug is a real
pain to get to. I found but just ended up taking the lower hose off. Filled
it back up and started it. Let it run for a while and added coolant as
needed. The heater only puts out heat when I accelerate while at idle its
cool air. I will take it for a short drive and check the level again. Time
spend about 5 hours, two bottles of coolant, and the flush thing. around
$25.00. If a heater core is needed I will take it in to be fixed. All this
and I was in the cold (25 F) and snow.
<HLS@nospam.nix> wrote in message
news:2n1kf.34900$6e1.28836@newssvr14.news.prodigy.com...
| Quote: |
"Tim & Linda" <lt.stoops@askme.net> wrote in message
news:8rWdnZgjvKZM5RLeRVn-qQ@comcast.com...
Is it possible for me to get a good system flush? Or should I just spend
the
$60 and take it to the shop?
You can do a pretty fair job yourself. You might want to take off both
radiator
hoses, take out the thermostat, and flush with a garden hose. You can
usually
take off one end of the heater hose and flush through the core as well.
Then replace the radiator hoses and thermostat with new. (There is never
a
better
or cheaper time to do it.)
Now, your original owner's leak may show up. It may be best to test the
system with
water alone until you are sure the heater is working and nothing is
leaking.
I hate
to lose new antifreeze when I dont have to.
|
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| Back to top |
|
|
Guest
|
| Posted:
Sat Dec 03, 2005 6:25 am Post subject:
Re: Flushing system |
|
|
"Tim & Linda" <lt.stoops@askme.net> wrote in message
news:beGdnbkXBpViOg3enZ2dnUVZ_sWdnZ2d@comcast.com...
| Quote: | I should of taken it to the shop. I went out and got a flush thing made by
Prestone to put in a heater hose. I got a new hose took the old one off
and
put this flush thing in it. Then I turned on the hose let it run for about
10 minutes then I started the truck and let it run for another 10 minutes.
I
got a bunch of junk out. Then we time to put it back together but I have
to
drain the water out so I can put antifreeze in. The drain plug is a real
pain to get to. I found but just ended up taking the lower hose off.
Filled
it back up and started it. Let it run for a while and added coolant as
needed. The heater only puts out heat when I accelerate while at idle its
cool air. I will take it for a short drive and check the level again. Time
spend about 5 hours, two bottles of coolant, and the flush thing. around
$25.00. If a heater core is needed I will take it in to be fixed. All this
and I was in the cold (25 F) and snow.
|
It was sort of a halfway job, the way you did it, Im afraid. But I agree,
run it
awhile and see what happens.
On things like this, you either fix them properly yourself or take it to the
shop.
Half measures avail nothing.... |
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Larry A.
Guest
|
| Posted:
Sat Dec 03, 2005 7:53 am Post subject:
Re: No heat |
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|
Sorry, I didn't catch the original message. Bear in mind that the
control valves are all vacuum operated - my Impala A/C got stuck in
one position; after a LOT of searching, I found a tiny vacuum line
with a hole in it (some battery acid had apparently dripped onto it.)
You should be able to hear/feel the airflow changing if you change the
controls from floor to vent to defrost, etc. - if no change, likely a
vacuum line.
On Fri, 02 Dec 2005 14:04:50 GMT, JRL <lecloony@hotmail.com> wrote:
| Quote: | You should be able to do the same thing from the firewall side where
the hoses go in. No need to go near the core unless it is bad.
On Thu, 1 Dec 2005 08:42:25 -0600, putt@webtv.net wrote:
one was warm but not hot the other was
cool.
meaning, coolant is not flowing through the core. The heater core is
just like the radiator, only in a mini-version. So, either there is a
faulty control valve(the T-stat is the 'control' for the radiator) or
the core is clogged with junk. I'd first suspect a faulty control in
the flow system to/through the core, if there is one. If that isn't the
case, then it's a problem with the core. Maybe you can 'back-flush' the
core with a water hose. Remove the hoses, put a garden hose on the core
hose connection that is the cold one. Turn on the hose.....at a slow
rate of flow....if there is not a flow control valve involved, and the
core isn't too badly clogged, water 'should' flow out of the connection
that was the warm hose. I'd have a length of hose on the other core
connection, to avoid getting the engine compartment wet if this flush
method works. If the flush works with this hose connection, reverse
them and make sure water flows both ways. Unfortunately, there can be
some bad news with the core even with if you get flow through the core.
If the core was clogged, whatever was stopping the flow, might also have
cause a break/hole in the tubing of the core...meaning it's a leaker! A
leaking core has only one fix.....replacment. Breathing the
chemical-laden air in the cabin is bad for the lungs. The 'life' of a
heater core is about 10yrs(give/take), depending on how well the cooling
system was maintained and the quality of the water used.
Hope some of this helps.....
Dave S(Texas) |
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