overheating problem

[STERLING STINGER]

this problem happened last year also, so i got my radiator and water pump replaced

 

 

 

 

first, i got in my truck and drove about 2 miles at 5am, and my thermostat was on the red...and no heat

i took it home and used my white truck to go pick up my worker.

 

i loosened my thermostat cover to see if it was bad and the heat started working, so i tightened it back up, filled with fluid, and went off for my day of plowing.

 

before anyone answers that i was driving with the plow down and tilted so air was getting to the motor stop right there.....give me a little credit!!!!!

 

i plowed like 5 hours and then all of a sudden.....yep, no heat and temp very high

 

brought it to my mechanic just to work on it myself in his garage....in case i couldnt fix it i could just of left it there.

 

like i said, he replaced my water pump and radiator in the summer, brand new

 

well after it cooled down, i removed the thermostat and it was stuck open from the heat, but there was no fluids in the motor, (behind the thermostat)

so i put cold water over the thermo to close it and put it back on.

added fluid, then nothing

 

after adding fluid and feeling hoses to see if they have anything in them for like 1/2 hour...the heat kicked on and everything went back to normal.

 

it took like 5X of starting the truck until the antifreeze started to go into the motor.

 

could this have anything to do with putting it into and taking it out of 4X4?

cuz i was doing that all day

i don't know

 

this happened last year...thats y i got the pump & radiator replaced!@!!!!!!!!!

[Geonovast]

Let me know if I have this right... you removed the thermostat, and it was stuck open. That means it's shot. Why didn't you simply replace it, since it was already out? That's most likely causing your problems. They're like 7-8 bucks.

[james750]

there may also be air trapped in the top of the engine, you need to either get a thermostat with a bleeder in the top of it (preferred method), or bleed it by parking on a hill and loosening the sending unit.

[Eagle]

could this have anything to do with putting it into and taking it out of 4X4?

No. Not related to using 4WD.

 

But unless you have converted, you have the "closed" cooling system. Those are VERY difficult to get all the air out of after working on the cooling system. One of the symptoms of not enough coolant is no heat. It seems contradictory that it would overheat yet not generate heat, but when the coolant level is low, nothing gets to the heater core. The engine can overheat, but you'll have no heat.

 

Do a search on "burping" the system.

[james750]

could this have anything to do with putting it into and taking it out of 4X4?

No. Not related to using 4WD.

 

But unless you have converted, you have the "closed" cooling system. Those are VERY difficult to get all the air out of after working on the cooling system. One of the symptoms of not enough coolant is no heat. It seems contradictory that it would overheat yet not generate heat, but when the coolant level is low, nothing gets to the heater core. The engine can overheat, but you'll have no heat.

 

Do a search on "burping" the system.

It's only difficult if you don't either drill a small hole in the top of your aftermarket thermostat or get a Dealership thermostat with a bleed valve in the top. I installed a dealership thermostat in my MJ on Monday, and I had no problems getting air out. ;) For those of you that read my thread on heater hose replacement, you would know that air in the system was the least of my problems! :rotf:

[STERLING STINGER]

Let me know if I have this right... you removed the thermostat, and it was stuck open. That means it's shot. Why didn't you simply replace it, since it was already out? That's most likely causing your problems. They're like 7-8 bucks.

 

the thermostat was not broken, why would i replace it?

it was open from the heat, it snapped shut once i cooled it down.

[Eagle]

Let me know if I have this right... you removed the thermostat, and it was stuck open. That means it's shot. Why didn't you simply replace it, since it was already out? That's most likely causing your problems. They're like 7-8 bucks.

 

the thermostat was not broken, why would i replace it?

it was open from the heat, it snapped shut once i cooled it down.

Any thermost that has been overheated is junk. The heat ruins the thermal calibration.

 

That's why you should replace it.

[STERLING STINGER]

thanks, i will replace today.

[STERLING STINGER]

could this have anything to do with putting it into and taking it out of 4X4?

No. Not related to using 4WD.

 

But unless you have converted, you have the "closed" cooling system. Those are VERY difficult to get all the air out of after working on the cooling system. One of the symptoms of not enough coolant is no heat. It seems contradictory that it would overheat yet not generate heat, but when the coolant level is low, nothing gets to the heater core. The engine can overheat, but you'll have no heat.

 

Do a search on "burping" the system.

It's only difficult if you don't either drill a small hole in the top of your aftermarket thermostat or get a Dealership thermostat with a bleed valve in the top. I installed a dealership thermostat in my MJ on Monday, and I had no problems getting air out. ;) For those of you that read my thread on heater hose replacement, you would know that air in the system was the least of my problems! :rotf:

what size hole should i drill in my thermostat?