Question about 2008 Jeep Patriot

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Heat not working when idle - 2008 Jeep Patriot

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Is it full of coolant? have you had any leaks and added some kind of stop leak to the radiator? Are the heater hoses hot to and from the heater core connections all the way up to the firewall?
if the hoses are not hot then it is a circulation problem.
If they are hot then it is inside the cab as a blend door problem some use electric controls some use vacuum I am not familiar with the patriot system.
It could be that you have a vacuum leak and it is not opening the blend door until you rev the engine to build a vacuum. it is hard to diagnose because there are many things that could cause it.

Posted on Jan 23, 2013

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