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HVAC, Air Conditioners, Aqua Hot, Primus, Webasto, Chassis Heaters, Furnaces and Water Heaters Questions and information about the wide variety of Heating and Air Conditioning as well as Water Heater systems available are discussed here.

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  #21  
Old 03-21-2019
badandy badandy is online now
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That black plastic tube just dumps under the bus, it's completely open. It looks "aftermarket" to me. I would think there'd be a small valve up there possibly with a drain hose attached.

You can see that drain valve to the right of the hose clamp pointing straight down. Weird, not aftermarket at all.
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  #22  
Old 03-23-2019
badandy badandy is online now
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OK so I have a partial success! I found a dead circuit breaker in the front lower panel which supplied power to the front heater switch, pump, and solenoid valve, so that's all working as designed.

The problem I have now is that I get no power in the engine compartment for the pump or valves with the summer/winter switch and I still do not have +12 going to the thermostat on the wall, so no chassis heater fans. If I jump the thermostat the fans work.

So I pulled the dash and I have +12 on the summer/winter switch (switch is new), but the purple circuit (35) that goes down into the harness seems to lead to nowhere. I just can't see far enough down in there to figure out where that wire goes because there's a mass of butt splices wrapped in tape that I can't begin to unravel just yet. I'm certain the wire color changes.

Does anyone happen to know where that summer/winter switch wire is actually routed to the pump/valves/thermostat? I'm getting the feeling now that I'm going to have to run some new wires (joy).
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  #23  
Old 03-23-2019
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Mike Hohnstein Mike Hohnstein is offline
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That's the high point in the cooling system, needle valve in the line to bleed the system, normal deal is run the system @ 1200 rpm, @ temp front of coach elevated some what, coolant flow with no air is the notion. Of course there should be a valve some where on the plastic line. Front heat rocker controls the sporlan that supplies that exchanger.
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  #24  
Old 03-23-2019
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Andy, on my coach at least, the ignition has to be on for the chassis heat fans to work.
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  #25  
Old 03-23-2019
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Here is a diagram of the thermostat, etc circuits for my 86. My PT36 does not have chassis heat in the bed room, but it does have propane there.

On my 83 FC the summer/winter switch enabled a relay in the curb side load cetner in the upper storage compartment (single beds)
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  #26  
Old 03-23-2019
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Gardner - thanks for the schematic - It doesn't match my setup at all, though. I think your FC was pretty much the same setup as my PT. I found those redrawn 1984 FC diagrams and they look very similar to my PT, but I'm still missing that one wire from the summer/winter switch to anything.
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  #27  
Old 03-23-2019
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On page 31 and 35 of the 1984 redrawn document there are references to the summer/winter switch and the valves. This is an FC document, but may hold a clue. 12 meg, to big to post.
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  #28  
Old 03-24-2019
badandy badandy is online now
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That end of the circuit is in place and working - the summer/winter switch has 12v on it. The missing link is between the switch and the pump/valve/thermostat.
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  #29  
Old 03-24-2019
LDM680 LDM680 is offline
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Andy:


Have you checked for continuity at the relay in the Left Rear Load Center? The attached drawing is for an 85. Your 83 may be different.
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Last edited by LDM680; 03-24-2019 at 09:05 AM. Reason: spelling
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  #30  
Old 03-24-2019
DW SD DW SD is offline
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Quote:
Originally Posted by LDM680 View Post
Andy:


Have you checked for continuity at the relay in the Left Rear Load Center? The attached drawing is for an 85. Your 83 may be different.
In my old PT35, that load center was above the center of bed against the rear wall.
Let us know if this is where you find the relay / controller for the coolant boost pump.
You received similar advice here to the email I sent, which is good!

I guess the missing link was the winter / summer circuitry.

Also, it seems like you missing fan switches at each heater core to individually turn those fans on / off or set to low speed. Those in my old PT allow tuning or adjustment of heat flow to each zone.

Hope you get it licked.

Cheers,
Doug
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