Heat not working

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01-19-2012, 08:51 AM

krypto384

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Heat not working

Today I went out and started my jeep just like ever other day. But today the temp is -9* and feels like -25*... Anyway heat worked great up tell today... I see no problems antifreeze is full and there no water on the inside of the jeep witch tells me I don't think it's the heater core.
Any ideas???????
Thanks for any input!!

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01-19-2012, 11:53 AM

Donnie_K

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Year: 1997

Model: Cherokee

Engine: 4.0, comp cam, 99 intake, apn header, neon injectors, Thunderbolt 2.5" High Flow Cat

well, if your engine is getting up to temp, your heater core is probably clogged, or the blend door isn't working right. If your engine is not getting up to temp then it's your thermostat.

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01-20-2012, 04:23 AM

kjc

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Year: 1993

Model: Grand Cherokee

Engine: 4.0L Laredo

Quote:

Originally Posted by krypto384

x2 what Donnie K said..
No water leaking in the cab is good, but a leaky core could still put out plenty of heat. It sounds like a clogged core. You could probably reverse flush it w/o doing a complete cooling system flush 'n fill.