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Old 02-19-2012, 12:47 PM   #1
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Anti-freeze smell

Maybe someone can help me with this. When I first start up my 2005 Monaco LaPalma I can smell anti-freeze but after a few minutes the smell goes away. I have checked for leaks and low levels of anti-freeze in the over flow bottle and have found none. Tanks in advance for the help.
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Old 02-19-2012, 01:13 PM   #2
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I assume this smell is inside the coach. If that's the case, I would suspect a small leak/seep in the heater core. You could try starting with the fan on high to see if it's worse. Otherwise, look at all the heater hose connections close or at the heater/firewall.
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Old 02-19-2012, 01:17 PM   #3
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He's right. The heater core is a good place to start. I know from experience. I was lucky, mine blew while still under warrenty
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Old 02-19-2012, 01:18 PM   #4
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If you mean antifreeze smell out back by the tailpipe and you got a diesel?? You have a coolant leak into the intake/cylinders somewhere. The at-start-up-only-smell could be a leak in the EGR cooler or like mine a leak from a fuel injector which can be water cooled. Yep, just a slight puff of white right at (most, not all) start up, a lingering antifreeze smell around the tailpipe, and then all gone like nothing was wrong. Slight coolant usage (maybe a qt/5,000mi) that was hard to correlate and a radiator leak-down test proved rock solid for days! You might also notice an occasional and very slight "misfire" like balk while cranking over only occasionally.

If this is the case, in time this seemingly minor thing WILL do serious damage. In my case it washed out one hole requiring replacement of the piston/hole as well as a reman head (Cummins ISM). Fortunately for me that was under warranty. Cummins thought they solved it a few months before by changing out the EGR cooler (which failed the high pressure leak test as well).
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Old 02-19-2012, 01:38 PM   #5
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Yes the smell is on the inside of the coach. The smell is no greater if the fan is on high or low. It dose not really smell like it is coming out of the vent.Thanks for the info. and I will keep looking.
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Old 02-19-2012, 01:53 PM   #6
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Quote:
Originally Posted by micki49
Yes the smell is on the inside of the coach. The smell is no greater if the fan is on high or low. It dose not really smell like it is coming out of the vent.Thanks for the info. and I will keep looking.
Then check for wet carpet under dash, there could a small drip under the heater box. Can't think of any other reason you would smell antifreeze inside the coach.
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Old 02-19-2012, 02:18 PM   #7
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Originally Posted by micki49 View Post
Yes the smell is on the inside of the coach.
Ah ha, more info! smell is inside!

Look for the heater core FEED lines running up into the dash unit from outside/underneath the coach. You will smell this inside. It could be a slight dribble out one of the clamps there or where the hoses join into the dash unit core - you will see stain marks if not moisture. You say the smell is not really out the dash vents which might eliminate the core itself and point to external seepage areas like hose clamps and old leaking hose.
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Old 02-19-2012, 02:49 PM   #8
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check to see if your local autoparts store has a cooling system pressure checker you can rent or borrow.
Basically looks like a radiator cap with a small hand pump on it. You can pressurize the cooling system when the engine is cold... then check for leaks.
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Old 02-19-2012, 05:49 PM   #9
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I had the same problem. Fix was to tighten plug on left side of eng block. Hope this helps Frank
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Old 02-19-2012, 07:19 PM   #10
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Thank guys you all have been a great help as usual. I will check all the above.
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Old 02-19-2012, 09:30 PM   #11
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You can add this when coach chassis is built chassis MFG may supply two heater hoses out of engine block than when coach builder puts in heater they add two hoses off it and splce with a nipple and four spring clamps just above the engine right hand side.
Need to remove dog house check right hand side of engine and see if you have a broken or weak spring clamp and replace with stainless steel screw clamp.
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