Help! No hot air/ engine overheats, Then hot air blows/ engine temp normal. - Jeep Wrangler Forum
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Old 11-04-2015, 04:38 AM
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Help! No hot air/ engine overheats, Then hot air blows/ engine temp normal.

I have a 2011 JK rubicon. The car sat during the summer for a month before sitting everything worked. After using the jeep for the first time, at idle the car over heated. I turned on the heat to cool off the engine draw heat away and the heat worked. the temp really was not helped by this but as soon as the car moved on the highway the temp would eventually drop back down.
I took the car in for service a leak was found in the radiator, I got the car back after radiator installed but soon after driving home the car overheats and the car would on and off blow cold or hot air even with the heat turned all the way up. I brought the car back again the thermostat was replaced. I drove the car home again same problem the jeep would overheat and would blow cold air with heat turned up .After driving on the highway the car s heat would drop down and the car would not blow hot air but then on occasion would. I took the car in again this time the water pump was replaced and radiator cap replaced. I drove the car for 15 minutes when the car got up to temp it blew hot air and was not over heating. i went to a drive through while the car was idling the car started to overheat and i turned on the hot air and it blew luke warm/ cold. i left and as I got out of the parking lot and drove heat temp dropped on the engine the heat inside the car worked , then the car stopped blowing hot air but as the car was in motion was not overheating. The oil seems to be free o coolant so i don't think the head gasket is blown. Please help!

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Old 11-04-2015, 04:57 AM   #2
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The luckiest problem would be a sticking thermostat, but actually does sound like a blown head gasket.
Both issues have similar symptoms

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Old 11-04-2015, 05:17 AM
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I have replaced he thermostat. I am not sure what would affect both engine heat and cabin heat? Or could it be the heater core and the head gasket or a fan issue or relay for the fan? More exploring to do.
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Old 11-04-2015, 05:28 AM   #4
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Sound like you have air trapped in the system and your not getting constant flow.
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blowing cold air , no heat , overheating while idling

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