HEATER

  • Tiny
  • MrEscape2001
  • Ford Ranger

I have a ford ranger truck 1998 with a four cy engine, the heater control will move to all dials but it will only work the defrost on all dials. I have about 127, 00 mileage on the truck. Why? : Lol:

Sunday, March 11th, 2007 AT 7:14 PM

2 Answers

  • Tiny
  • fordtech1
  • Member

Check for a vacuum leak in the engine compartment.

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Sunday, March 11th, 2007 AT 7:55 PM
  • Tiny
  • TaurusWheel
  • Member

Fordtech is right, defaulting to defrost mode is classic vacuum issue with Fords, there's a vacuum leak somewhere, also once I ran across where the linkage fell off the blend door, resulting in same. Vacuum leak could be at the function control valves, they are combo I believe of electric and vacuum. I had an older Taurus where if you were climbing a long hill at highway speed, it would lose the vacuum supply to the function control and it would revert to the defrost mode, heat a or a c, I even tried putting an extra-large vacuum storage tank in the line still no good, the low engine vacuum climbing the hill would take it all away

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Monday, March 12th, 2007 AT 2:25 PM

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