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Old 04-22-2013, 03:36 AM   #1
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Antifreeze smell when heater is turned on

I just bought a used 2005 winnebago adventurer and when I turned on the heater we smell antifreeze. Heater core leak?
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Old 04-22-2013, 03:51 AM   #2
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Most likely. If you use the defrost mode does it fog up the windows?
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Old 04-22-2013, 03:54 AM   #3
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sounds reasonable. doesn't take much of a leak to be able to smell it, or create god on your windshield. a pinhole will do it.
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Old 04-22-2013, 03:55 AM   #4
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sorry, fog on the windshield.
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Old 04-22-2013, 04:04 AM   #5
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Unless you use Propylene Glycol antifreeze (less toxic) it is poisonous and the leak needs to be taken care of ASAP.
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Old 04-22-2013, 10:25 AM   #6
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Quote:
Originally Posted by jenrobsdad View Post
I just bought a used 2005 winnebago adventurer and when I turned on the heater we smell antifreeze. Heater core leak?
It will not take much antifreeze to smell it. I would run the engine, turn on the heater and look around the heater where the rubber lines connect to the heater core. A small drip will show up if it is leaking. The heater takes outside air in in some cases to be heated so a external leak would contaminate the inflow air for the heater and you would smell it. If you turn on the defroster system and your windows fog up and you smell antifreeze I would suspect the heater core has a leak. Let us know how this turn out for you. Good luck.
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Old 04-22-2013, 11:58 AM   #7
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I have had that smell twice. Once in my MH and once in my car. Both times it was the heater core. Let us know what you find. Good luck. I had to change the heater core in a 2003 Chieftain and had to pull the front cap off below the windshield.

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Old 04-22-2013, 12:22 PM   #8
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I had the same symptom and used the GMAC leak repair tablets. I figured it would be a temporary fix. That was about six years ago and it is still holding.

i crushed them up before adding them to the radiator.
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Old 04-22-2013, 12:41 PM   #9
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You need to pressure test your cooling system preferably when cold for safety to locate the problem.

Pressure testing your coolant system for leaks - YouTube
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Old 04-22-2013, 01:15 PM   #10
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Hello sounds like a heater core as well best time to check for any antifreeze leak is when its cold .Antifreeze tends to leak when cold not hot.
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Old 04-22-2013, 01:21 PM   #11
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I had the same symptom and used the GMAC leak repair tablets. I figured it would be a temporary fix. That was about six years ago and it is still holding.

i crushed them up before adding them to the radiator.
I wouldn't be bragging about that..............You should really fix the problem. What will happen is when you need it and rely on it the most out in the middle of no where......That's when it'll puke on you.
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Old 04-22-2013, 01:33 PM   #12
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About half the time we found that the heater core was not leaking. If the clamps on the heater hose get loose, it will allow anti freeze to shoot into the heater and look and smell like a core leak. I hate to say it, but a lot of people have paid for a heater core replacement and all the mechanic did was tighten the clamp. I would check the clamps first.
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Old 04-22-2013, 11:27 PM   #13
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Actually there is not afogging issue on the window and the smell seems to go away after a while.
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