heater

FORD RANGER
Avatar
MRESCAPE2001
  • MEMBER
  • 3 POSTS
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:
Mar 11, 2007 at 7:14 PM
Advertisement
Avatar
FORDTECH1
  • MEMBER
  • 23 POSTS
check for a vacuum leak in the engine compartment.
Mar 11, 2007 at 7:55 PM
Avatar
TAURUSWHEEL
  • CAR REPAIR CONTRIBUTOR
  • 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
Mar 12, 2007 at 2:25 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.