1991 Overheating Question?
Thread Starter
Pro
Joined: Jun 2002
Posts: 563
Likes: 0
From: Raleigh NC
1991 Overheating Question?
We'll I'm back again. This time its on overheating. The 91 after driving for about 2 hours with or with out a/c starts to push 260 degree's. It hasn't complete overheated yet, I won't let it and it seems to stablize there, but it makes me nervous. I've always heard Vettes run hotter, but this seems way too much. Is there a problem and if so where should I start? 
Thanks
Ken
Thanks
Ken
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
Have you changed fluid lately? If so did you burp the system? This could be a stuck thermostat, air in the system, fans not running, or if any leaks could be hoses, faulty waterpump, or leaky radiator to name a few.
Team Owner
Joined: Dec 2000
Posts: 21,094
Likes: 282
From: Phila., PA burbs
Originally Posted by 84vette96
Are you looking at the analog gage or the digital ? My 96 made me nervus before I learned what the marks stood for.
No digital gauge on a 91 (unless aftermarket)
Team Owner
Joined: Sep 2002
Posts: 22,209
Likes: 12
From: OBAMA IS HITLER
my '90 has an HVAC digital readout.....coolant temp can be read by pushing the 2 buttons concurrently, at top, until "00" reads.....then push right button until "16" reads.....then push middle button for coolant temp in *C.
*F = *C X 1.8 + 32
dat dere izz the gig.
*F = *C X 1.8 + 32
dat dere izz the gig.
Racer
Joined: Jan 2001
Posts: 386
Likes: 0
From: Ludlow Ma
overheating??
I have an '88 coupe with 88k. I thought it was runnng too hot. If you haven't done the following yet, then have at it before changing anything.
1- clean between the radiator and in front of it. There was a load of stuff between mine. Plastic, leaves, leaves turning into compost, etc. You get the picture. I got a grabby entension thing at the dollar store and it made it a lot easier to clean out!
2- make sure you have full fluid. If you have air in the system, you'd get a lite on the dash. That happened when i changed coolent.
After this, I ran cooler but wanted more. I changed thermostat to 180
and fan sensor also. Haven't had any worries since.
Good luck
1- clean between the radiator and in front of it. There was a load of stuff between mine. Plastic, leaves, leaves turning into compost, etc. You get the picture. I got a grabby entension thing at the dollar store and it made it a lot easier to clean out!
2- make sure you have full fluid. If you have air in the system, you'd get a lite on the dash. That happened when i changed coolent.
After this, I ran cooler but wanted more. I changed thermostat to 180
and fan sensor also. Haven't had any worries since.
Good luck
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Melting Slicks
Joined: Mar 2003
Posts: 2,898
Likes: 0
From: Oklahoma City Oklahoma
Originally Posted by Hot Rod 90
my '90 has an HVAC digital readout.....coolant temp can be read by pushing the 2 buttons concurrently, at top, until "00" reads.....then push right button until "16" reads.....then push middle button for coolant temp in *C.
*F = *C X 1.8 + 32
dat dere izz the gig.
*F = *C X 1.8 + 32
dat dere izz the gig.
Team Owner
Joined: Dec 2000
Posts: 21,094
Likes: 282
From: Phila., PA burbs
Originally Posted by CMYC4GO
Which buttons are you talking about???!!!!
https://www.corvetteforum.com/techti...=193&TopicID=2
Thread Starter
Pro
Joined: Jun 2002
Posts: 563
Likes: 0
From: Raleigh NC
Originally Posted by Big *****
We need more info. Is the coolant level ok? Are the fans coming on? Does the upper radiator hose heat up?
The fans come on and appear to be operating properly. The coolant is full and is clean (However I am planning on changing it anyway). After the temps rise for awhile I get a check engine light. It flashes code 32, which indicates an EGR problem. I hope this helps. I will check on the upper radiator hose. Thanks for everyones replys.
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
I think JIMBO7 has laid it out well. I stared running hot over a period of time, got hotter each month. Changed the thermostat on principal, really did not think it was bad. I was really thinking the radiator. It fixed me up. Heated in a pan of hot water and could see it was not opening properly. Do the cheep, easy most common thing first.
Last edited by pcolt94; May 16, 2006 at 06:56 AM.
