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89 vette overheats after 10 minutes????????

nelson84

Well-known member
Joined
Aug 28, 2006
Messages
829
Location
Canada
Corvette
84 Z51 two tone bronze coupe 85 black on black
What would cause a 89 vette to overheat after 10 minutes? It runs fine for ten minutes and then suddenly starts to over heat???? Why would that happen?

theromstat?

The reason I am asking is because a guy is selling it and he doesn't know why either?

What causes over heating?
 

vetteboy86

Well-known member
Joined
May 26, 2003
Messages
2,760
Location
IN
Corvette
1986 Black "Indy 500 Pace car replica"
Thermostat would be the first place I would look. How is the rest of the cooling system....water pump, radiator, coolant, and cooling fan?
 
E

ejrempel

Guest
Are the front and rear fans going on? No fans means overheating.
 
J

johnny80

Guest
I had similar problems with my 88. Realized that the fan was not kicking on after 180 degrees. Thought I had to replace the entire fan housing and motor, just realized that it was the motor. The check that I did was turn on the AC and see if the fan kicks on. if the fan does not start, simply replace the motor, only about 40.00 at a any auto part store. Pretty easy fix and now she runs great, never gets hot. Do you have dual fans on a 84?
 
R

rel3rd

Guest
Define your view of OVERHEATING please.

In 10 minutes, it's almost impossible to be overheating already.
Are you going by the gauge reading?

I'd suspect an air pocket in cooling system causing bogus readings.
 
Joined
Apr 4, 2003
Messages
174
Location
So Cal
Corvette
1996 LT4 Collector Edition
I would agree with the air pocket idea. I've had that happen to me after I've dumped and refilled the cooling system. Does the temp spike very rapidly? If so, then the cooling system just needs to have the air bled out of it. There's an air bleed screw on the thermostat housing of my '96. Just crack that open until water starts coming out then close it up. You might need to do it a couple times to get all the air.

Barry
 
8

89sleeper

Guest
What are the high temps you are getting???
I have a 89 vert with 10,000 actual miles on it this car reaches 221 degress before the cooling fans turn on then the temp begins dropping at that time (this is perfectly normal) it also has a 195 degree thermostat from the factory
Ten minutes does sound a little fast from a cold start to over heat conditions
 

Hot Rod Roy

Well-known member
Joined
Jul 6, 2005
Messages
317
Location
Mission Viejo CA
Corvette
Yellow '84 Coupe
Is he selling the car because he can't figure out why it overheats? If so, he's probably tried all the easy things. That's a pretty serious decision to sell the car because you can't find the problem!! Let some sucker fight it for a while?? Can he show you receipts of the work done to try solving the problem? Could be serious trouble! He might know the problem, but doesn't want to tell you.
 

Notorious

Well-known member
Joined
Oct 9, 2005
Messages
53
Location
Confederate States of America
Corvette
Highly modified '95 A4 coupe
In 10 minutes, it's almost impossible to be overheating already.
Not if there's compression leaking in the cooling system. Put a pressure tester on it and tell me how much pressure it's building and in what amount of time.
 
R

rel3rd

Guest
Not if there's compression leaking in the cooling system. Put a pressure tester on it and tell me how much pressure it's building and in what amount of time.

That's where the "almost" comes into play...;)
 

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