Overheating!!!! What could STILL cause this???
09-26-2004, 04:01 PM
#1
Race Car
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Overheating!!!! What could STILL cause this???
Ok, a while back i was overheating due to a thermoswitch. I fixed that and its been SOOO much better. Lately though im overheating again. Not all the time though. Its more randomly if at all. The fan relays work, the coolant was just changed, thermoswitch is new...everything else looks to be ok i think? What could make me overheat??? The guage was kinda bouncing too here and there. Could i have a faulty heat guage?? Any help would be appreciated! Thanks everyone!
09-26-2004, 04:17 PM
#2
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Hey Tony,
Info from Clark's Garage:
Car runs hot/temperature fluctuates.
1. If the car runs hot and the radiator is cool, the thermostat sticking is a possible cause.
2. The coolant system may not be properly vented.
3. There may be a blockage in the hoses or radiator.
4. The cooling fans may not be operating properly. This can be caused by the fan relays, fuses, or the thermofan switch. One fan is for normal operation. It should run in warm weather if you are sitting in traffic. The other fan will normally run if the A/C is on.
5. An incorrect water/antifreeze ratio can cause the car to overheat. For most climates, a 50/50 mixture is best for all weather conditions.
6. The head gasket may be leaking.
7. The water pump may be bad. Rebuilt water pumps have been known to have the pulley slip on the shaft. Others have had the pump impeller separate from the shaft.
8. The temperature sensor or gauge may be faulty.
9. The radiator cap may be faulty. If you do not have a coolant pressure tester and suspect the radiator cap, most major auto parts stores can test it for you.
Info from Clark's Garage:
Car runs hot/temperature fluctuates.
1. If the car runs hot and the radiator is cool, the thermostat sticking is a possible cause.
2. The coolant system may not be properly vented.
3. There may be a blockage in the hoses or radiator.
4. The cooling fans may not be operating properly. This can be caused by the fan relays, fuses, or the thermofan switch. One fan is for normal operation. It should run in warm weather if you are sitting in traffic. The other fan will normally run if the A/C is on.
5. An incorrect water/antifreeze ratio can cause the car to overheat. For most climates, a 50/50 mixture is best for all weather conditions.
6. The head gasket may be leaking.
7. The water pump may be bad. Rebuilt water pumps have been known to have the pulley slip on the shaft. Others have had the pump impeller separate from the shaft.
8. The temperature sensor or gauge may be faulty.
9. The radiator cap may be faulty. If you do not have a coolant pressure tester and suspect the radiator cap, most major auto parts stores can test it for you.
09-26-2004, 08:31 PM
#4
Racer
Join Date: Jul 2004
Location: Edmonton, Alberta Canada
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test your coolant, maybe it's too thick of a mixture and you're good to -20 or something like that, throw in 12 oz's of redline "water wetter", you'll notice a tremendous difference!! Also, try a 25 coolant 75 water mixture. But as listed above.. go thru those steps
my problem was a bad t-stat switch on the rad, then bubbles in the system
my problem was a bad t-stat switch on the rad, then bubbles in the system
09-27-2004, 01:04 AM
#5
Drifting
How old is your radiator? How many times do you recall pumping ordinary, mineral-laden tap water in the coolant tank? Those plastic radiators with the wafer-thin water jackets, are probably so encrusted with lime scaling, rust and other organisms, the unit is most likely 50% effective...at best. I bet money that a new one will bring the temps way down below normal now.
