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More Schematics
Here is a picture of a schematic of the fan control knob, ties into Temp control and the A/C clutch switch, and what’shappening is there is always heat combing out of the vents, so I turned off the big gate valve in the engine compartment, so either the hot water solenoid is not working or the power to solenoid from knob is not working rite. Here is a schematic of that system it shows 2 things that look like the solenoid under front where spare tire would go but I only see 1. and Coil SensThermswitch? where is this and what does it do?? and a pic of the bottom of the 1 solenoid under front
All this stuff is Prevost, but not on over the road air coaches.
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4 Replies
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Art, those diaphragms in the valves have been known to stick.
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Another cause could be the temp sensor may be bad, dirty, mis-located? I don’t know where it is located?
The solenoid/valve in your lower pic is either a dash circuit freon valve or heater core water valve. I can’t tell from your pic. My bus has both, behind the frt bumper up high, for the dash ac and heater circuits. The size of the water lines are roughly 5/8″ or 3/4″. The size for Freon are much smaller.
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Don you have Over the Road Air so it is different but all the other ones are like mine
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roof of spare tire compartment toward pass side will have a u-turn fluid by pass attached to it. must have 24volt for your heat or defrost to work. opens valve and let fluid thru(hot) Normally closed
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