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Heat not working in coach or in dash on 1991 xl
Gentleman,
I have no cabin heat or dash heat on my 91 Prevost with over the road air. The pump in the drivers side ac bay runs but there is no heat forward of the pump and valve. How do I tell if it is possibly the dash rheostat or the valve next to the pump in the ac bay? Thank you.
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4 Replies
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Dentalguy,
It would be best to add a signature line with your Converter so folks can help with a specific vintage.
Your name would also help.
I’ll let the OTR guys answer the question.
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In line for front defroster/heater the is a elect shut off valve normal closed. The front heat control opens it up. Note there is a return/bypass loop in hot side/supply line that lets fluid return to engine. Open the control valve(from heat switch) and hot coolant flows thru heat exchanger. This is basic prevost set up. It is active on my XLE conversion shell. Bob
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So with regards to the heater/defroster it is either the heat control switch failure or the valve itself.. Am I correct the heat control switch is a rheostat on the dash? Where is the actual valve?
Bill Guy
91 Marathon XL 2 -
The heat control is a knob that should be on the RH side of the main dash in line with the knob that turns on the dash air fan and controls the speed. I am going by memory so take what I said with a grain of salt.
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