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Wehren's avatar
Wehren
Explorer
Jan 08, 2017

Engine heater

Anyone else have a problem with the engine heater and the window defroster not working properly. The fan goes on but no heat. We have a 99 Monaco Windsor. If you have had this problem, what did you do to correct it. I would appreciate any information and help I can get. Jim Wehren

2 Replies

  • ILVMYGT's avatar
    ILVMYGT
    Explorer
    Jan 08, 2017
    You may have one or booster pumps that help move coolant from the back of the coach to the front. If they are not working it takes along time for the heater to work. One of my pumps is located in the engine bay and the other in the front below the HVAC unit.
  • sch911's avatar
    sch911
    Explorer
    Jan 08, 2017
    Check to make sure hot coolant is getting to the heater core. There is an on off flow control valve on most dash heater units. You can tell under the hood. Find the heater hoses and see if both are hot in and out of the HVAC box (do this by touch). If not follow the cool hose back until you find the valve.

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