Hey everyone, I've been running my car without a thermostat for awhile now because every time I put a thermostat in this car, it overheats! Yes, I'm putting the thermostat in right side up, and I've replaced the water pump recently (6 months ago), but I can not get it to stop over heating.
When driving with the thermostat installed, it will heat up to just past the third mark on the temp gauge, and hang there. If I put it in neutral while driving and rev it up to near redline a couple of times, then it rapidly drops down to just below the middle notch, then begins to overheat again.
When I leave it running in neutral in my drive way, it inches up to the middle mark very slowly; no quicker than it did without a t-stat, and then stop at the middle mark, sometimes going above the middle mark, but only about a needles width, but the hose below the t-stat (rad to t-stat) stays frigid cold. Atleast when driving it gets a little hot.
Also, when i'm driving the car, the heater works very well and blows very hot until it gets to the third mark, then the heater starts blowing ice cold.
I'm completely perplexed by this and have no idea what could be causing it. Am I not bleeding the system correctly? How am I supposed to bleed the system? I have to get to work tomorrow morning, and this is my only car (no busses or taxis in my town either) so I'm really hoping I can get this fixed tonight, even if it means putting the old drilled out t-stat back in it.
Heater core hoses hooked up backwards??
Just something to check. Yes I've done it when switching motors out.
Rad blocked or head gasket ??
Check radiator, probably clogged
Or at least get fins washed
Last edited by Vanos Baku; 01-12-2015 at 02:47 AM.
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Check the thermostat is functioning properly, put it in some boiling water make sure it opens. I once installed a new(behr) thermostat that was defective and I chased my tail trying to find the problem.
Once you have verified that the thermostat is working and installed it bleed the system of any air. Make sure your heat is set to hot to allow coolant to pass through the heater core.When you have topped off the coolant squeeze all the hoses with your hand to try and force any air in the system up towards the bleeder screw. It can sometimes help if you jack the front of the car as to raise the bleeder screw so its higher up in the coolant system.
Hi! I wanted to find out if this problem has been solved, since my problem is exactly the same. And if she decided, how exactly?
Thanks for the answer! But it cools down to normal in traffic, and if I'm not driving fast, the engine cools down too. But the higher the speed, the more the engine overheats.
Sometimes it helps to cool the engine if revving in neutral gear.
The belt on the generator was also changed, the tension was made good. But the problem was not solved.
I checked the cooling system a bit the other day. I took off the radiator, all the pipes, the thermostat, washed everything, cleaned it, then poured water and rinsed the system properly with it. I leaked some dirt.
But! First, I installed a radiator without a fan to flush the system. As a result, the car was never able to overheat while it was standing and revving the engine. The thermostat was opening and the lower nozzle was hot. As soon as I washed everything and put it back together, the problem returned while driving.
And for some reason it helps if you turn off the engine and then start it up again, after these actions the temperature begins to drop slowly, the thermostat opens, and the temperature stays normal for a while. Then the engine begins to overheat again and restarting again helps to lower the temperature.
If I don't do this, then antifreeze starts to fly out from under the radiator cap due to overheating.
check your fan clutch.
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