Heater

Tiny
MRESCAPE2001
  • MEMBER
  • 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 Replies

Tiny
FORDTECH1
  • MEMBER
  • 23 POSTS
Check for a vacuum leak in the engine compartment.
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Sunday, March 11th, 2007 AT 7:55 PM
Tiny
TAURUSWHEEL
  • MECHANIC
  • 718 POSTS
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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