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Discussion Starter #1
Can't seem to get any idle heat out of my 08 unlimited. I replaced thermostat and back flushed the heater core.. It'll start to over heat until I get moving above 50 mph.. Then the temp will drop back to normal .. Then I'll get heat till I stop moving .. Help???
 

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Could be a couple things that are causing this. You might have air in the system or you might have a worn water pump. We just had a caravan in the shop with a similar problem. The pump looked fine on the outside but once we pulled it there were only two blades left on the impeller.
 

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You might be able to see if the coolant is circulating at an idle if you look in the radiator. This may or may not be accurate.
 
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