rear heater

Joined
Jun 6, 2018
Messages
43
Location
El Dorado Hills, CA
The other day I noticed some type of fluid material around the rear heater. It did not appear to be gasoline. I never use the heater but once or twice recently I turned it on to see if it was functional, which it was. Any idea what it could be? I have attached a pic.

1901953
 
Joined
Jun 6, 2018
Messages
43
Location
El Dorado Hills, CA
Oh got it...that makes sense as it did appear to be that kind of consistency. Does that indicate an issue when it appears in that location or is that within the normal range of events?
 

GA Architect

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Feb 14, 2014
Messages
2,751
Location
Woodstock, GA
Oh got it...that makes sense as it did appear to be that kind of consistency. Does that indicate an issue when it appears in that location or is that within the normal range of events?
You should not have a leak in that location. It is ether your supply or return line, their connections or the core. Below is an exploded diagram of the piping and rear heater.

1902114


1902115
 
Joined
Jan 20, 2016
Messages
218
Location
Yakima,wa
Don't lick the puddle? Antifreeze is only toxic if you eat it. Keep dogs and kids out of the back until you fix it or cap the lines. You probably have a pinhole leak in the heater core or the hose.
 
Joined
Jan 20, 2016
Messages
218
Location
Yakima,wa
Hahahahha thanks. So I understand the mechanism... does the antifreeze only circulate to the rear heater if I turn on the heater or does it circulate back there are part of the normal flow?
I'm not too familiar with the rear heater or late model systems in general but usually the circulation is turned off when you have the heat off/temp set to cold. Early series ones had a manual shutoff on the engine for the heater coolant, might look for that. That damp patch isn't a danger to the engine.
 

GA Architect

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Feb 14, 2014
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2,751
Location
Woodstock, GA
Perfect... I will look for it
Suggestion: Keep the top off the rear heater. Drive the 40 around and warm it up. Once the engine is warm, park the rig. And with it running, pull the "warm pull" switch to circulate the heated antifreeze. DO NOT PULL THE "FAN PULL" SWITCH, IN CASE THE REAR HEATER CORE HAS SHIFTED. Now get in the back and look for what is leaking. Be careful and use gloves, the heater core could be veddddy hotttt.

Since the rear heater is leaking, be sure to check the front as well.
 
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