Overheating
Thread Starter
Safety Car
Joined: Aug 1999
Posts: 4,931
Likes: 3
From: Fort Lauderdale FL
Overheating
I replaced the waterpump in my 87 vert and as of now the car overheats quickly. The fan is not coming on and the radiator cap was cool to touch. Anything I need to do to make this fan come on so the temps don't shoot to 260?
Le Mans Master
Joined: Feb 2006
Posts: 8,753
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From: Louisiana
That doesn't sound right. Have you made sure that the water pump is pumping. Was there an existing problem with the temp. before you replaced it? If the radiator cap is cool that means the water is not circulating. The stat could be sealed closed. Just some ideas.
Team Owner
Joined: Sep 2001
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
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Sounds like the thermostat is stuck closed, and you may need to reburp the system.
Check those before proceeding further.
Check those before proceeding further.
Thread Starter
Safety Car
Joined: Aug 1999
Posts: 4,931
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From: Fort Lauderdale FL
The temps were fine before replacing the waterpump. I was replacing it because it was making noises and the shaft was wearing thin. However the new pump feels hot to touch. I called it quits for now.. but if the t-stat is stuck.. does that mean I need a new one ? How do u go about burping the system ?
Team Owner
Joined: Sep 2001
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
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If its the original stat, it should open at 195F. At which point the temperature should hold for several moments as it cycles open and closing. If its not doing that, the stat is bad. Yes, you need new.
Burping is done by removing the rad cap, and leaving it open up to stat-opening temperature. Once its open (if its opening) hold the rpms to 2000, and fill to the top.
Burping is done by removing the rad cap, and leaving it open up to stat-opening temperature. Once its open (if its opening) hold the rpms to 2000, and fill to the top.
Race Director
Joined: Jun 1999
Posts: 14,924
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From: Merritt Ils Fl
Odd that the stat would pick this occasion to fail but it sure sounds like it. Words lead me to believe the stat was not disturbed in the H2O swap. Shot in the dark: is the belt on correct? is it possible to put the belt on so the pump turns in the wrong direction? I don't know.
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Race Director
Joined: Sep 2000
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From: The Top of Utah
The symptoms sound like a stat, but as said, why at the same time the pump was replaced? Why aren't the sensors triggering the fans? Since it is what you did, could you possibly have installed a standard rotation water pump? At a minimum, it sounds like the cooling system isn't full.
RACE ON!!!
RACE ON!!!
Thread Starter
Safety Car
Joined: Aug 1999
Posts: 4,931
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From: Fort Lauderdale FL
Originally Posted by Muffin
Shot in the dark: is the belt on correct? is it possible to put the belt on so the pump turns in the wrong direction? I don't know.
Thread Starter
Safety Car
Joined: Aug 1999
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From: Fort Lauderdale FL
Originally Posted by CFI-EFI
The symptoms sound like a stat, but as said, why at the same time the pump was replaced? Why aren't the sensors triggering the fans? Since it is what you did, could you possibly have installed a standard rotation water pump? At a minimum, it sounds like the cooling system isn't full.
RACE ON!!!
RACE ON!!!
I will be putting a new T-stat in tmw and hopes that cures my problem. Just my luck.
Race Director
Joined: Sep 2000
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From: The Top of Utah
Originally Posted by 87vette
The one I got was... http://www.stewartcomponents.net/Mer...y_Code=ChevyS1
I will be putting a new T-stat in tmw and hopes that cures my problem. Just my luck.
I will be putting a new T-stat in tmw and hopes that cures my problem. Just my luck.
RACE ON!!!
Thread Starter
Safety Car
Joined: Aug 1999
Posts: 4,931
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From: Fort Lauderdale FL
Originally Posted by Lichen
Something is haywire. If all of the above mentioned checks don't solve your problem, you may have a defective water pump.
Team Owner
Joined: Sep 2001
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
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How long ago did you get the Stewart, its been awhile since they were available, I've been looking at that site regularly for a couple months and only the chrome one has been available.
Stewart would be the last one I expect to fail.
Stewart would be the last one I expect to fail.
Thread Starter
Safety Car
Joined: Aug 1999
Posts: 4,931
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From: Fort Lauderdale FL
Originally Posted by vader86
How long ago did you get the Stewart, its been awhile since they were available, I've been looking at that site regularly for a couple months and only the chrome one has been available.
Stewart would be the last one I expect to fail.
Stewart would be the last one I expect to fail.
Thread Starter
Safety Car
Joined: Aug 1999
Posts: 4,931
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From: Fort Lauderdale FL
Ok ... I replaced the thermostat on the vette. I put in a 180 degree thermostat. the temps are now around 190. However the fan didnt kick on at all and my coolant overfill tank got sucked dry and I had to pour more coolant inside it. However the Radiator cap has steam coming out of it at this time. I don't know if it was spilled coolant or if this is normal ? I'm going to wait till it cools down a bit before I open the cap. I turned the motor off early because the steam didn't look right to me.
Le Mans Master
Joined: Oct 2003
Posts: 6,130
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From: seattle WA
Unless you changed the temp switch it needs to get up around 210 before the fan comes on! And, if you've still got the old thermostat-put
it in some water in a pan on the stove, bring the water near boiling and
watch the thermo-if it opens-you've just replace a working thermostat.
it in some water in a pan on the stove, bring the water near boiling and
watch the thermo-if it opens-you've just replace a working thermostat.
Last edited by rick lambert; Feb 25, 2006 at 11:52 AM.
Thread Starter
Safety Car
Joined: Aug 1999
Posts: 4,931
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From: Fort Lauderdale FL
I just went back out and the temps were fine till it hit 190 and the radiator starts steaming again. I let it run till it hit 225 then turned it off because the fan is still not coming on. What gives ? The radiator cap is hot to touch still. Something isnt right.