My Airflow Control Switch For Heater Isn't Working In My 1992 Ford F150

SOURCE: 2004 Ford F150 - AC/Heater blower speed 1 & 2 not working.

You might have a bad speed selector switch, or your blower motor resistor is faulty.

Evan Jenson

• 122 Answers
• Posted on Nov 02, 2008

SOURCE: 1992 ford f150

I'd try cleaning the throttle body, and replacing the coolant temp switch. Hope this helps

Ned C Cook

• 3433 Answers
• Posted on Oct 14, 2009

SOURCE: 2004 ford f150 a/c heater control cycles on and

Possible low refrigerant or too much head pressure in a/c system. It's called short cycling.

SOURCE: 2002 Ford F150. Cruise control stopped working.

Did you have the recall done on it ?
recall 05S28. Description: Speed Control Deactivation Switch.

It could be a blow fuse in the recall harness, if you did have it done.

Try the self test, and see what the results are. If you do not get it into self test mode, it could be the fuse in teh recall harness that is blown. The 1st revision of the recall harness was an inline ATM fuse, not sure if the revision 2 was the same. If that fuse is blown, the switch is leaking, and should be checked.

Self-Test Diagnostics

WARNING:
This test is a key on engine off (KOEO) test only that is conducted in park only with emergency brake fully engaged.

1. Enter self-test diagnostics by depressing the speed control OFF switch while turning the ignition key ON, making sure the engine does not start and is not running. The speed control indicator on the instrument panel will flash once to indicate that speed control module entered the diagnostic mode. Five additional flashes at this point indicate a defective speed control servo. Release the OFF switch.

2. Press the remaining switches in this sequence: ON, RESUME, COAST and SET/ACCEL.

If the ON switch is not depressed within five seconds after entering the diagnostics mode, the module times out and the procedure must be started over.

The speed control indicator lamp will flash as each switch is depressed. Press each switch in the sequence immediately after the indicator light goes out for the previous switch.

Note:
There will be a slight delay when the last button is pressed and the lamp flashes.

3. A lamp flash with the last button (SET/ACCEL) indicates that the static test passed. If the lamp does not flash with the last button and there are no additional flashes of the lamp, the switch is defective.

If the lamp does not flash with the last button, and additional flashes occur, follow the chart below for trouble codes:

— 2 flashes - BPP defective, circuit is defective, brake applied, CPP switch or jumper (if equipped).

SOURCE: 1992 ford f150 speedometer quit working and ABS

where the speedometer cable goes into the transmission under the car, when removed from the trans there is a small gear that gets worn out over time.. that little gear or the entire speedometer cable needs to be replaced. An easy and inexpensive fix. I believe the ABS light is on because the computer needs the speed of the car to make its calculations for braking. As long as the speedometer is not working, it cannot do that. So after the speedometer cable issue is fixed, that issue should be fixed as well.