| Author |
Message |
way2fast
Guest
|
 Posted:
Thu Oct 06, 2005 7:56 pm Post subject:
1998 Chevy Z71 Overheating Help!! |
|
|
I have a 1998 Chevy Z71 4 wheel drive that is acting up. I have replaced
the thermostat and the waterpump and still no change to the overheating.
I figured maybe it could be the head or the head gasket but there are no
signs of any leakage no milky oil, no water comin out of the tail pipe. I
am runnin out of options any suggestions would be greatly apprciated thanks
|
|
| Back to top |
|
 |
Woody
Guest
|
| Posted:
Thu Oct 06, 2005 8:07 pm Post subject:
Re: 1998 Chevy Z71 Overheating Help!! |
|
|
Collapsing hoses..
"way2fast" <way2fast900rr@nospam.aol.com> wrote in message
news:1be231f32a69fd4ef3bb325a86afa72b@localhost.talkaboutautos.com...
| Quote: | I have a 1998 Chevy Z71 4 wheel drive that is acting up. I have replaced
the thermostat and the waterpump and still no change to the overheating.
I figured maybe it could be the head or the head gasket but there are no
signs of any leakage no milky oil, no water comin out of the tail pipe. I
am runnin out of options any suggestions would be greatly apprciated
thanks
|
|
|
| Back to top |
|
|
TheSnoMan
Guest
|
| Posted:
Thu Oct 06, 2005 8:31 pm Post subject:
Re: 1998 Chevy Z71 Overheating Help!! |
|
|
Woody wrote:
| Quote: | Collapsing hoses..
"way2fast" <way2fast900rr@nospam.aol.com> wrote in message
news:1be231f32a69fd4ef3bb325a86afa72b@localhost.talkaboutautos.com...
I have a 1998 Chevy Z71 4 wheel drive that is acting up. I have replaced
the thermostat and the waterpump and still no change to the overheating.
I figured maybe it could be the head or the head gasket but there are no
signs of any leakage no milky oil, no water comin out of the tail pipe. I
am runnin out of options any suggestions would be greatly apprciated
thanks
|
Make sure the clutch fan is working properly, as they do go bad. If it
is okay, you may have a plugged radiator core but my nickle is on the
clutch fan.
--
-----------------
www.thesnoman.com
|
|
| Back to top |
|
|
Guest
|
| Posted:
Thu Oct 06, 2005 11:17 pm Post subject:
Re: 1998 Chevy Z71 Overheating Help!! |
|
|
Two good clues have already been posted.
If the fan clutch is the issue, it should only overheat in slow traffic or
when idling. At highway speeds, you get enough cooling, usually,
even if you had no fan at all.
Sometimes the exterior fins of the radiator will get blocked with grass
clippings, leaves, paper, 'love bugs' or other detritus. This can occur
between the air conditioner condensor and the radiator sometimes
so you have to look carefully.
Some engines are really bad about holding an air bubble when you
think you have them full of coolant. You have to be careful you get
this bubble out.
An internally blocked radiator or a bad radiator cap can also be
issues.
Last, if you have eliminated everything else, you have to consider
an internal engine problem. If you have a cracked head or block,
or blown headgasket, hot exhaust gases can enter the coolant and
heat you up fast. You don't always see oil in the water, or coolant
in the oil when this happens.
Some GM engines have some well documented 'weaknesses'. Which
engine do you have?
I wish I knew how and where to do an FAQ on this subject, since there has
been a lot of conversation this year about overheating. |
|
| Back to top |
|
|
Bob
Guest
|
| Posted:
Thu Oct 06, 2005 11:46 pm Post subject:
Re: 1998 Chevy Z71 Overheating Help!! |
|
|
In article
<1be231f32a69fd4ef3bb325a86afa72b@localhost.talkaboutautos.com>,
way2fast900rr@nospam.aol.com says...
| Quote: | I have a 1998 Chevy Z71 4 wheel drive that is acting up. I have replaced
the thermostat and the waterpump and still no change to the overheating.
I figured maybe it could be the head or the head gasket but there are no
signs of any leakage no milky oil, no water comin out of the tail pipe. I
am runnin out of options any suggestions would be greatly apprciated thanks
|
At highway speeds, you get enough cooling, usually,
even if you had no fan at all.
At highway speeds mine runs very hot, always has. I agree with you.
What might be my problem? |
|
| Back to top |
|
|
Bob
Guest
|
| Posted:
Thu Oct 06, 2005 11:50 pm Post subject:
Re: 1998 Chevy Z71 Overheating Help!! |
|
|
In article <_Sd1f.1858$xD7.1035@newssvr29.news.prodigy.net>,
HLS@nospam.nix says...
| Quote: | Two good clues have already been posted.
If the fan clutch is the issue, it should only overheat in slow traffic or
when idling. At highway speeds, you get enough cooling, usually,
even if you had no fan at all.
Sometimes the exterior fins of the radiator will get blocked with grass
clippings, leaves, paper, 'love bugs' or other detritus. This can occur
between the air conditioner condensor and the radiator sometimes
so you have to look carefully.
Some engines are really bad about holding an air bubble when you
At highway speeds, you get enough cooling, usually,
even if you had no fan at all.
|
At highway speeds mine runs very hot, always has. I agree with you.
What might be my problem?
| Quote: | think you have them full of coolant. You have to be careful you get
this bubble out.
An internally blocked radiator or a bad radiator cap can also be
issues.
Last, if you have eliminated everything else, you have to consider
an internal engine problem. If you have a cracked head or block,
or blown headgasket, hot exhaust gases can enter the coolant and
heat you up fast. You don't always see oil in the water, or coolant
in the oil when this happens.
Some GM engines have some well documented 'weaknesses'. Which
engine do you have?
I wish I knew how and where to do an FAQ on this subject, since there has
been a lot of conversation this year about overheating.
|
|
|
| Back to top |
|
|
way2fast
Guest
|
| Posted:
Fri Oct 07, 2005 1:39 am Post subject:
Re: 1998 Chevy Z71 Overheating Help!! |
|
|
I really appriciate the feedback and so fast. Here we go I checked the
clutch fan it is working properly... the hoses dont seem to be collapsing
but in this instance i think it would be safe to go ahead and replace
them. I was really thinking it could be something blocking internally in
the radiator so I am going to flush it really well and see if that fixes
the problem. Also just to throw this out it is not getting hot just
idleing it when you go and drive it it fluxuates up and down it will be
really hot and then drop 60-80 degrees and then continue to go back up
again. Again thanks for all the help |
|
| Back to top |
|
|
Woody
Guest
|
| Posted:
Fri Oct 07, 2005 4:10 am Post subject:
Re: 1998 Chevy Z71 Overheating Help!! |
|
|
By collapsing hoses I meant internally. They separate inside and block the
flow....
"way2fast" <way2fast900rr@nospam.aol.com> wrote in message
news:1214fde1b19836fc9fbccb02676eaa0c@localhost.talkaboutautos.com...
| Quote: | I really appriciate the feedback and so fast. Here we go I checked the
clutch fan it is working properly... the hoses dont seem to be collapsing
but in this instance i think it would be safe to go ahead and replace
them. I was really thinking it could be something blocking internally in
the radiator so I am going to flush it really well and see if that fixes
the problem. Also just to throw this out it is not getting hot just
idleing it when you go and drive it it fluxuates up and down it will be
really hot and then drop 60-80 degrees and then continue to go back up
again. Again thanks for all the help
|
|
|
| Back to top |
|
|
TheSnoMan
Guest
|
| Posted:
Fri Oct 07, 2005 4:35 am Post subject:
Re: 1998 Chevy Z71 Overheating Help!! |
|
|
way2fast wrote:
| Quote: | I really appriciate the feedback and so fast. Here we go I checked the
clutch fan it is working properly... the hoses dont seem to be collapsing
but in this instance i think it would be safe to go ahead and replace
them. I was really thinking it could be something blocking internally in
the radiator so I am going to flush it really well and see if that fixes
the problem. Also just to throw this out it is not getting hot just
idleing it when you go and drive it it fluxuates up and down it will be
really hot and then drop 60-80 degrees and then continue to go back up
again. Again thanks for all the help
|
How did you determine that it was working properly? Does it engaged
going down the road when engine get hot? It should as it just does not
work at a idle and low speeds. Lots of times they get weak and do not
cool properly. Also you cannot relie on ram air to keep it cool all the
time. My 2000 K3500 never gets hot no matter what I do but it has a 10
bladed HD clutch fan and a 4 core radiator and I can here the fan coming
in and out on hot days towing on highway keep temp under 200. It will be
6 this winter and it has not hit 210 yet. Proper clutch fan operation it
VERY important for proper cooling becuae ram air will not cut it a lot
of the time on a hot day with A/C on
--
-----------------
www.thesnoman.com |
|
| Back to top |
|
|
TheSnoMan
Guest
|
| Posted:
Fri Oct 07, 2005 4:36 am Post subject:
Re: 1998 Chevy Z71 Overheating Help!! |
|
|
Likely chasing gremlins here
Woody wrote:
| Quote: | By collapsing hoses I meant internally. They separate inside and block the
flow....
"way2fast" <way2fast900rr@nospam.aol.com> wrote in message
news:1214fde1b19836fc9fbccb02676eaa0c@localhost.talkaboutautos.com...
I really appriciate the feedback and so fast. Here we go I checked the
clutch fan it is working properly... the hoses dont seem to be collapsing
but in this instance i think it would be safe to go ahead and replace
them. I was really thinking it could be something blocking internally in
the radiator so I am going to flush it really well and see if that fixes
the problem. Also just to throw this out it is not getting hot just
idleing it when you go and drive it it fluxuates up and down it will be
really hot and then drop 60-80 degrees and then continue to go back up
again. Again thanks for all the help
|
--
-----------------
www.thesnoman.com |
|
| Back to top |
|
|
Rodan
Guest
|
| Posted:
Fri Oct 07, 2005 7:21 am Post subject:
Re: 1998 Chevy Z71 Overheating Help!! |
|
|
"way2fast" wrote:
..... not getting hot just idling
when you drive it it fluctuates up and down
it will be really hot then drop 60-80 degrees then go up again.
__________________________________________________
This can be caused by a failing thermostat.
Rodan. |
|
| Back to top |
|
|
Guest
|
| Posted:
Fri Oct 07, 2005 6:05 pm Post subject:
Re: 1998 Chevy Z71 Overheating Help!! |
|
|
"Rodan" <Rodan@verizon.NOT> wrote in message
news:RYk1f.16054$C51.3546@trnddc07...
| Quote: | "way2fast" wrote:
.... not getting hot just idling
when you drive it it fluctuates up and down
it will be really hot then drop 60-80 degrees then go up again.
__________________________________________________
This can be caused by a failing thermostat.
Rodan.
|
Well, he said he replaced the thermostat, but he could have
gotten a bad one off the shelf, I guess.
I am wondering now if he is really overheating, or whether the
gauges are falsely indicating a fluctuating overheat. That would
be important to be sure of.
If he took off the lower radiator hose, and flushed the radiator
with a garden hose, he might be able to estimate if water is
passing through the core readily. If not, take that puppy out
and head to the radiator shop.
Assuming the radiator is okay, then we are beginning to move
uncomfortably close to an internal engine problem. |
|
| Back to top |
|
|
Guest
|
| Posted:
Fri Oct 07, 2005 6:13 pm Post subject:
Re: 1998 Chevy Z71 Overheating Help!! |
|
|
"TheSnoMan" <admin@snoman.com> wrote in message
news:rxi1f.10530$QE1.4695@newsread2.news.atl.earthlink.net...
| Quote: | way2fast wrote:
I really appriciate the feedback and so fast. Here we go I checked the
clutch fan it is working properly... the hoses dont seem to be
collapsing
but in this instance i think it would be safe to go ahead and replace
them. I was really thinking it could be something blocking internally
in
the radiator so I am going to flush it really well and see if that fixes
the problem. Also just to throw this out it is not getting hot just
idleing it when you go and drive it it fluxuates up and down it will be
really hot and then drop 60-80 degrees and then continue to go back up
again. Again thanks for all the help
How did you determine that it was working properly? Does it engaged
going down the road when engine get hot? It should as it just does not
work at a idle and low speeds. Lots of times they get weak and do not
cool properly. Also you cannot relie on ram air to keep it cool all the
time. My 2000 K3500 never gets hot no matter what I do but it has a 10
bladed HD clutch fan and a 4 core radiator and I can here the fan coming
in and out on hot days towing on highway keep temp under 200. It will be
6 this winter and it has not hit 210 yet. Proper clutch fan operation it
VERY important for proper cooling becuae ram air will not cut it a lot
of the time on a hot day with A/C on
|
Er, Snowman, the viscoelastic fan clutch works at optimum when at idle.
It slips at high speeds because the engine doesnt need the coupling as
much.
When the surrounding air temperature increases, the thermal element
allows a more direct coupling of the oil filled clutch and lets it regulate
temperature a little better.
You can give a simple test to a viscoelastic clutch. With the engine
off, just try to spin the fan. If it moves, but you feel the drag, then
the clutch is most likely okay. If you feel no drag at all, it is probably
bad. If it is totally locked, that isnt good. |
|
| Back to top |
|
|
Guest
|
| Posted:
Fri Oct 07, 2005 6:36 pm Post subject:
Re: 1998 Chevy Z71 Overheating Help!! |
|
|
By the way, snoman...
that is a nice site.
Did you set it up yourself, or did you have a computer consultant do it?
What kind of software is needed?
|
|
| Back to top |
|
|
TheSnoMan
Guest
|
| Posted:
Fri Oct 07, 2005 8:19 pm Post subject:
Re: 1998 Chevy Z71 Overheating Help!! |
|
|
HLS@nospam.nix wrote:
| Quote: | "Rodan" <Rodan@verizon.NOT> wrote in message
news:RYk1f.16054$C51.3546@trnddc07...
"way2fast" wrote:
.... not getting hot just idling
when you drive it it fluctuates up and down
it will be really hot then drop 60-80 degrees then go up again.
__________________________________________________
This can be caused by a failing thermostat.
Rodan.
Well, he said he replaced the thermostat, but he could have
gotten a bad one off the shelf, I guess.
I am wondering now if he is really overheating, or whether the
gauges are falsely indicating a fluctuating overheat. That would
be important to be sure of.
If he took off the lower radiator hose, and flushed the radiator
with a garden hose, he might be able to estimate if water is
passing through the core readily. If not, take that puppy out
and head to the radiator shop.
Assuming the radiator is okay, then we are beginning to move
uncomfortably close to an internal engine problem.
|
You are looking in the wrong places. Replace the clutch fan and I will
bet your troubles will go away. Your simptoms match a bad clutch fan
almost perfectly. Or you can keep spinning your wheels. Many years ago I
had a plow truck start to overheat badly one winter. Turned out to be a
bad clutch fan too though my first choice then was thermostat.
--
-----------------
www.thesnoman.com |
|
| Back to top |
|
|
|
|
|
|
FAQ
Memberlist
Register
Profile
Log in to check your private messages
Log in