heater issue (1 Viewer)

Joined
Sep 15, 2005
Messages
906
Location
Denver, CO
 
 
 
Drove my NTM 74 piggie home yesterday. Went great, but was a little chilly. The heater seemed to only be blowing cold air (yes the warm pull was pulled) so I turned it off. I felt the pipe going into the heater and it was hot to the touch, so I kicked the fan to high. Hot air! yay! for 5 seconds, then it was cold again. hmm. I could do that over and over...turn it off...wait a bit...then turn the fan on and get hot air for 5 seconds. any clues? Thanks

T
 

3_puppies

SILVER Star
Joined
Dec 2, 2002
Messages
13,980
Location
Helena MT
 
 
 
 
Was the pipe leaving also hot? plugged core? or core that is so full of debris it won't let the heat out of it? Pull the duct and look inside, it the top of the core looks like a dead rat, there's your problem. Plugged core you can try using the CLR flush trick.
 
Joined
Feb 14, 2007
Messages
230
 
 
The heating system is very straight forward. Jeff Zepp has this article on his web site about keeping warm in an old cruiser - same information will apply to your pig. As the truck is new to you, a first step would be to make sure the core is clear of any debris, dust and fur.

If that doesn't clear it up, and you decide to go through the control valve, heater core and replace the heater hose - you can put a 1/2" connector on the feed/return lines in the engine compartment to bypass the heaters so that you can stay on the road while you go through the heater system components.
 

cruiserbrett

Moderator
Joined
Feb 19, 2002
Messages
2,565
Location
San Diego
 
 
 
 
I bet the heater valve or core are plugged up. after a few minutes, the coolant will transfer heat to the core, but b/c the flow is reduced to almost zero, it takes a while. then its reduced to ambient air temps quickly b/c there is not enough coolant flow to keep it warm.
 

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