only41or2

Heard what i believe is air in system. no heat when over heating. thermostat seems to be working. cant get 3 miles without system pegging the temp meter. had it towed home didnt want to run the chance of blowing head gasket or warping heads. Need advice.. How do i burp the system. Do you think its a bad heater core or water pump or both?

fb97xj1

What year, and when was the cooling system serviced last?

only41or2

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only41or2

sorry. New here. 97 Jeep Grand Cherokee. and i put brand new antifreeze in system after i flushed it just last week.

fb97xj1

The radiator is blocked or the water pumps impeller is worn out. Or both, even. Something is keeping the coolant from circulating, and either of those will do it. How old are they? If you dont know, replace them.

only41or2

ok. How do i burp the system? would that have anything to do with the overheating? I will replace the water pump. i don't know when anything was done. bought this jeep only 5 months ago. did not come with a mechanic history.

fb97xj1

I forgot about the burping. It should do that on its own, just leave the cap off with the engine running. All ive ever done is remove the radiator cap, fill it, then let the engine idle with the heater on full. When the coolant level drops, i fill some more. When it stops dropping, i stop filling and stick the cap back on, fill the overflow to the hot mark, and drive off. Never had an issue. Sometimes i just fill and squeeze the upper hose slowly with the cap off until the bubbles stop. Never had any issue doing that either. Did just that with the Mustang a couple weekds ago. Temp is right it should be.

CurrySoSpicy

I would just rebuild the cooling system. Judging by the number of overheating threads on this forum. It almost seems like it should be a right of passage for a new Cherokee owner.

only41or2

ok. so its definitely not the water pump. took it out and the propeller is just fine. cannot figure out why lower hose is cold. took it out made sure there is nothing clogging. it was ok. radiator seems fine. thermo is fine. I am at a loss. Heater core maybe?