ZX2 A/C blower fan will not go into highest speed

1999 FORD ESCORT
99,000 MILES
Avatar
SNETHEJ
  • MEMBER
  • 9 POSTS
I've seen many questions and answers regarding the fan only working in high speed, but my fan will not go into high speed (I'll call 4). It will work in positions 1, 2, and 3 just fine (or should I say, low, low-medium, high-medium?). Does that seem like a relay issue like some of the other blower issues, or something else?
Sep 1, 2011 at 11:40 AM
Advertisement
Avatar
WRENCHTECH
  • CERTIFIED EXPERT
  • 20,761 POSTS
That's probably a bad switch but should be tested first.
Sep 1, 2011 at 12:04 PM
Avatar
SNETHEJ
  • MEMBER
  • 9 POSTS
I pulled the connector on the resistor to test the switch and the switch seemed to be working. As it turns out, the connector on the resistor looked like it had overheated at one time, melting the connector a little. The connection was a little corroded and all I did was cleaned the connectors on the plug and the resistor a little and it started to work.
Oct 10, 2011 at 10:28 AM
Advertisement
Avatar
WRENCHTECH
  • CERTIFIED EXPERT
  • 20,761 POSTS
I guess that would make sense. The reason I didn't suggest the blower resister in the first place is because an internal problem with the resister effecting high speed would have also taken out the lower speeds but an external plug problem would not. Glad you found the problem.
Oct 10, 2011 at 10:37 AM