LT1 overheating
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Joined: Apr 2006
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From: Midwest City, Ok
LT1 overheating i need some help......after about 2-300 miles of highway driving the engine starts to over heat, and keeps over heating in like 3-4 mins. but when i just do local driving there are no problems......plz help me!!!!!
right but if the values for high speed are too high then they wont turn on until they hit that value. so if for some reason his are like over 210-235 or something like that it could cause his car to overheat on the highway where the mph is high enough to change the values for the fans to high speed temp values.
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Originally Posted by imnotplutonium
right but if the values for high speed are too high then they wont turn on until they hit that value. so if for some reason his are like over 210-235 or something like that it could cause his car to overheat on the highway where the mph is high enough to change the values for the fans to high speed temp values.
If highways driving is making your overheat its most likely a water pump problem or a tstat stuck closed, since there is plenty of cool air and you dont need fans on the highway.
Easiest thing to do is replace the t-stat first.
Easiest thing to do is replace the t-stat first.
check your cooling system. Do your fans turn on? Check if the fans turn on after it reaches the maximum temperature(depending on what temperature your fans turn on). Check if theres enough coolant, check the water pump, check for any possible leaks, thermostat. I had a water pump failure which caused my car to overheat and got it fixed.
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Originally Posted by imnotplutonium
right but if the values for high speed are too high then they wont turn on until they hit that value. so if for some reason his are like over 210-235 or something like that it could cause his car to overheat on the highway where the mph is high enough to change the values for the fans to high speed temp values.
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Thread Starter
Teching In
Joined: Apr 2006
Posts: 26
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From: Midwest City, Ok
Originally Posted by Steve40th
Doesnt the ECT sensor in the water pump also tell the PCM/ECM what the temp is to ensure that it knows when to turn the fans on?
i have the electric cooling fans on togle switches....
Is there lots of water near the weephole on the pump? Have you flushed the coolant recently? After letting your car warm up to operating temperature, are both the top and bottom radiator hoses very hot and the same temperature?
Originally Posted by imnotplutonium
mine was set to 30 stock. and i guess it does sound more like the thermostat or water pump since there is plenty of air at high speeds.
Taking what you just said there and this thread into consideration, I find it incredibly difficult to believe you are working with a stock pcm.
Originally Posted by infinitebird
No offense man, but I have tuned a lot of LT1 cars and have never seen that. That is not the stock value.
Taking what you just said there and this thread into consideration, I find it incredibly difficult to believe you are working with a stock pcm.
Taking what you just said there and this thread into consideration, I find it incredibly difficult to believe you are working with a stock pcm.
Last edited by imnotplutonium; May 16, 2006 at 02:03 PM.
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From: Midwest City, Ok
Originally Posted by urbanhunter44
Is there lots of water near the weephole on the pump? Have you flushed the coolant recently? After letting your car warm up to operating temperature, are both the top and bottom radiator hoses very hot and the same temperature?
no leaks
yes i have flushed it
YES both hoses are HOT!
Waterpump, or the waterpump gasket.
Odds are if they replaced the opti, they replaced the gasket. You have too, when you do that much work to it.
IMO, its in that area. Could be a faulty thermostat, but I wouldnt get your hopes up.
Check for burnt wires, and possible coolant leaks.
Make sure your fans are workin too.
Hint:
In crowded situations, turn the A/C, even if you dont have any.
It will tell the PCM to enable the fans. Its one of those little tricks.
Good Luck
Odds are if they replaced the opti, they replaced the gasket. You have too, when you do that much work to it.
IMO, its in that area. Could be a faulty thermostat, but I wouldnt get your hopes up.
Check for burnt wires, and possible coolant leaks.
Make sure your fans are workin too.
Hint:
In crowded situations, turn the A/C, even if you dont have any.
It will tell the PCM to enable the fans. Its one of those little tricks.
Good Luck
