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Unread 11-04-2013, 08:58 AM   #1
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2005 TJ Wrangler 
Join Date: Oct 2013
Location: Moab, UT, UT
Posts: 56
Heater blows smoke?

I recently bought a 2005 Rubicon with 70k on it. Now that it has cooled down outside, I've noticed that when first turning the heat on or whenever changing the air temp dial from cool to warm or vice versa, smoke blows out of my vents and to me it smells like burning radiator fluid. This only last for about 30 seconds, or occasionally a little longer. I can't find any leaking radiator fluid and there are no leaks on the ground. Has anyone seen this before or know what the problem is?

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Unread 11-04-2013, 09:29 AM   #2
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2004 TJ Wrangler 
Join Date: Feb 2005
Location: Tyee Capital of Canada
Posts: 1,789
Sounds very much like you have a heater core leak, the a/f sits in the fins of the heater core until you turn on the fan, then it blows out in an extremely fine mist. Antifreeze will stick to your windshield. If you drag your finger across the windshield, you will leave behind an oily looking streak if it is antifreeze there. You can confirm a leak by, blocking or joining the lines going into the heater core at the firewall. If after a couple of days the "smoking" disappears, but returns after reconnecting the hoses, you have definitely got a heater core leak.
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