Help With Installing Manual Fan Switches For A 98 Gt

Just wondering. Have you tested the fan ground back to battery negative? Seems to me like a reasonable possibility of a bad connection after the connector got so hot that it melted. Further it's a spot with recent work.

Does grounding CCRM pin #17 (LG/P) wire cause the high speed fan to work? The fan is on an "always on circuit" so all that's needed for this test is a scrap piece of wire to jump pin #17 to a known good ground.

Note, if it does, that proves the basic function of the HS fan and CCRM. Further it offers an easy way to do what it is that you want to do. This method also has the advantage that HEAVY duty wiring and/or relays aren't needed. As a reminder that the fan can draw in excess of 50 amps. Not a job for a light weight switch or relay.

However. Be forewarned that the Mustang's fan control logic is quite sophisticated. Forcing the fan to run all the time will delay motor warm up. During periods of cooler temperatures, will likely make the motor run cold. During cool weather will may also cause the AC suction pressure to drop too low thus causing the AC to short cycle.

The PCM also turns off the fan above 45 MPH. This saves fuel and prevents the fan from becoming a generator.

I'm getting ready to do the same thing today for a friend of mine's going to do it I'm hoping and I've done just what you have replaced a bunch of stuff starter you know of the cluster in my gauge in the car for overheating is bad and you can't even get that anymore yeah I just this is driving me nuts! I'm going to tape him doing this today and maybe I'll post it if it's pretty straightforward all right well good luck!

Wow I thought my grammar sucked!!,,??..