TTA with fan on high (heater) suddenly blows cold air and engine temp rises sharply to around 230 then heat comes back on and the temp drops to 160, this happened about 20 times on the way back from the track today. High temp fan was activated with the high temp, so this was real. If the thermostat was sticking intermittently would you lose heater core flow?
Weird overheating problem
- Thread starter Quick89
- Start date
I don't think you would. I've noticed lately on my car that the thermostat won't open at first until 195 degrees and I have the 160 in it. When this happens I still have heat.
Then after it opens the first time after its cold it will fluctuate between 160-180??
Then after it opens the first time after its cold it will fluctuate between 160-180??
mikestertwo
Well-Known Member
- Joined
- Sep 13, 2006
Sounds like the water stops circulating for some reason 
If the thermostat is sticking, you should still have hot water at the heater I would think. Maybe the impeller is coming loose on the water pump?
If the thermostat is sticking, you should still have hot water at the heater I would think. Maybe the impeller is coming loose on the water pump?HellOnWheels
HellOnWheels
- Joined
- Feb 3, 2002
When mine did that it was a head gasket.....hope that's not you problem tho.
83ttypecooled
Active Member
- Joined
- Sep 14, 2003
Hi,
You are correct, this is unusual.The first thing that comes to mind is one you are not gonna want to hear, but due to the erratic nature of this beast, I must mention it, anyway. Are you CERTAIN you have a full load of coolant? Low coolant does nutty things to a motor. If that is ok,then I would again look at the waterpump or thermostat.When filling these cars, put the heater on, so the control valve is open.Also, make sure you have the correct waterpump, as I think these impellers are backwards in their rotating direction. Last, but by no means least, a top quality thermostat is vitally important,installed correctly. Given your symptoms, there should be other problems evident, besides just no heat once in a while, etc. Let us know.
You are correct, this is unusual.The first thing that comes to mind is one you are not gonna want to hear, but due to the erratic nature of this beast, I must mention it, anyway. Are you CERTAIN you have a full load of coolant? Low coolant does nutty things to a motor. If that is ok,then I would again look at the waterpump or thermostat.When filling these cars, put the heater on, so the control valve is open.Also, make sure you have the correct waterpump, as I think these impellers are backwards in their rotating direction. Last, but by no means least, a top quality thermostat is vitally important,installed correctly. Given your symptoms, there should be other problems evident, besides just no heat once in a while, etc. Let us know.
