Car running hot
Thread Starter
Heel & Toe
Joined: Oct 2005
Posts: 19
Likes: 0
Car running hot
My car is running hot and the temp will get up to 255. I can shut the engine down and within 1 min the temp will go down to 220.. Does this sound like a thermostat problem? The fans are not coming on either... Can some give me some feed back...
Le Mans Master
Joined: Jan 2008
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From: corpus christi Texas
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Advanced
Joined: Dec 2010
Posts: 61
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From: Kingsburg Ca
Check the 3 fan relays in the engine bay fuse box ;Mine was doing the same thing a week ago;Had a bad relay $7.00 each replaced all three just for fun Problem solved Give that a shot ..Good Luck..Matt
Team Owner
Joined: Mar 1999
Posts: 22,025
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From: At the beach in little Rhody
Pull the intake tract including the MAF. Then remove the four 10mm screws holding the top plastic radiator support. You will then be able to see between the radiator and the condenser.
Le Mans Master
Joined: Jan 2008
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From: corpus christi Texas
Tech Contributor
Joined: Dec 2006
Posts: 10,962
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From: Van Buren Arkansas
Wounded Warrior Escort '11
I asked the question about the HVAC being turned on for a very specific reason but no answer. If the HVAC is on and the fans start running, then there's no issue with the fuses and probably not the relays.
Instructor
Joined: Jul 2011
Posts: 184
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From: Millersville, MD
This is good to know
So I am just asking, but we can run water on this to get it clean? Can you also use a light brush to clean it and then run the water to get the debris off of it? Thanks, CF Strikes again
Thread Starter
Heel & Toe
Joined: Oct 2005
Posts: 19
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The fans come on when the HVAC is on but they don't come on at any other time. Just when the HVAC is on...
Racer
Joined: Feb 2004
Posts: 359
Likes: 7
From: St. Paul MN
Ok..I drove the vette to work today, whithout doing anything but pushing on radiator hoses and the temp stayed under 220... Thermostat sticking????
At highway speed did it hang around 190? That is the temp where the thermostat will open & close to keep you right at that temp.
I'm in the middle of a head/cam project and had the luxury of removing the radiator to see what's going on. A couple passes of shopvac (from the front), 100psi compressed air wand (from the rear), and water stream (from the rear) did pretty well. Then a can of the foaming HVAC coil cleaner from Home Depot, and it shines like the sun! I would avoid any brushing, as it can mash the vanes and prevent airflow.
Before:
Foaming cleaner:
After:
Tech Contributor
Joined: Dec 2006
Posts: 10,962
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From: Van Buren Arkansas
Wounded Warrior Escort '11
Here is the circuit. Please note that if the fans come on with the HVAC running, then you most likely have debris plugging things up as already mentioned. No need to check fuses, relays and so on.
