This topic contains 10 replies, has 10 voices, and was last updated by Jonathan Gabriel 1 year, 4 months ago.
Hi guys, i am having a problem with WJ jeep 1999 4.7
The car is heating only when i am accelerating.
If the car is standing still on the parking lot, heater blows cold air.
If i am revving the engine from 1000 to 2000 and back, or accelerating the heater starts working.
When driving, heating works-ish.
I checked the water pump. It looks normal, nothing broken or weird about it.
Flushed the heater core, about 4 times. I’ve also changed coolant. Every time I do this, I also bleed the system to get air out. Every time i flush it, heating works little bit better. After few days starts getting worse.
Is there anything else to check????
When I bought the car 8 months ago I had a leak, so I’ve used stop-leak product.
Which was a mistake, but I am new to this car repairing.
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