I pray to god its not

[NTRA08]

A BHG!!! Okay... My car doesn't overheat with the thermostat out. (obviously) But when I install the thermostat it starts to overheat. But only when I'm driving it. Its fine at idle. The radiator is full with 50/50. I can drive the car and it overheats. Well I figured out that if I get out and relieve the pressure in the radiator while the car is still running, it cools down. (quick) Dumb but it works. And thats it until next time I drive the car. The thermostat is new. There is no water in the oil and no oil in the water. ???????????? HELP

 

[NTRA08]

BTW its a 2.0mm Greddy MHG. About 12,000 miles on the motor. And yes Greg Sabin this is Jared.

 

[fonz87]

................bhg ?


there might be bubbles in your system, try to flush it out and refill back in. See if that helps

 

[Keros]

Try a new radiator cap and pressure test the whole system for leaks.

And stop letting it overheat or that will cause a BHG.

 

[Mk3runner]

Jack car up in front fir good measure to.

 

[tissimo]

You have a bhg.

 

[IJ.]

Tested the thermostat yet?
(pot of water on the stove and watch it to see if it ever opens)

 

[kotu100]

or just buy another one, they're like $10

 

[NTRA08]

Tested the thermostat yet?
(pot of water on the stove and watch it to see if it ever opens)

Yeah I tested the thermostat. Works fine. Its new. I had a fail safe one time those work great. No leaks. All hoses have been replaced. I did put a shorter hose on the bottom. But haven't changed the cap yet.

 

[jdub]

Did you cut the jiggle valve off? I've had a new T-stat held closed by the pressure behind it. Removing the juggle valve fixed it.

 

[NTRA08]

Did you cut the jiggle valve off? I've had a new T-stat held closed by the pressure behind it. Removing the juggle valve fixed it.

Its still there. But isn't it there for a reason.

 

[jetjock]

My car doesn't overheat with the thermostat in. (obviously) But when I install the thermostat it starts to overheat.

What does that mean?

I'm assuming it means the car doesn't overheat with the thermostat out. If so what does the temperature gage show under those conditions. Lower than normal, normal, or higher?

 

[NTRA08]

What does that mean?

I'm assuming it means the car doesn't overheat with the thermostat out. If so what does the temperature gage show under those conditions. Lower than normal, normal, or higher?

Sorry about that. I should have seen that.:nono:

With the thermostat out it runs lower than normal. Unless I'm sitting in traffic. With it in it starts to get past normal so I relieve the pressure and it goes down. The motor has never overheated. I just mean it starts to get above normal and keeps going until I relieve the pressure. But I fix it every time before it gets too hot.

 

[Nick M]

On another note, do you have a belt on the waterpump?

 

[NTRA08]

On another note, do you have a belt on the waterpump?

UH yeah:biglaugh:

 

[tissimo]

What do you mean relieve the pressure?

 

[Nick M]

Is the impeller still on the shaft? Is the radiator look ok on the inside? Is there dirt on the outside, between the intercooler and radiator? Does it flow good, even though it looks ok on the inside?

You must look at how it operates(the cooling system) to decide what is wrong.

After you determine it works as designed, and has no fault, then you move to what is causing excess heat in the engine.

 

[NTRA08]

What do you mean relieve the pressure?

I do the stupid thing and turn the radiator cap with a towel while the car is on. Dumb huh. but it works. I just turn it a little. not enough to where it shoots off.

 

[jetjock]

Does running the heater on high bring the temp down?

 

[NTRA08]

Is the impeller still on the shaft? Is the radiator look ok on the inside? Is there dirt on the outside, between the intercooler and radiator? Does it flow good, even though it looks ok on the inside?

You must look at how it operates(the cooling system) to decide what is wrong.

After you determine it works as designed, and has no fault, then you move to what is causing excess heat in the engine.

Its a new radiator. No condenser. So I have good air flow. No dirt or anything. Inside of the radiator looks like it should. And I don't know about the impeller shaft. I haven't checked it yet.