Update: (and request for help!)

I replaced the AC pressure switch. Problem still exists.

So, when this all started, I attempted to change the blower speed, which popped/broke something. That is when everything stopped. This is when the fuse hold was melted. I'm not sure if the blue #8 fuse actually blew or not, but what else could have been taken out in the process?

Like I said earlier, if I jump the terminals for the aux and blower motors where the relay plugs in, both motors DO work. The compressor WILL engage.

I also tried to "revert" the wiring back to factory, and nothing worked. No aux fan, no blower motor, and no compressor engage.

I'm scratching my head here so hard it hurts!

Thanks!

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'85 300D 190K miles
running on B100 Biodiesel since 156K, SCRATCH THAT! I can only find Biodiesel at 1 location in Houston! (not very convenient)

Aux fan and blower motor are on separate fuses. Only the aux fan is switched by a relay (inside black plastic cover driver's fender). The blower is switched by the push button unit directly (no relay) I believe. If the wiring has been messed with, what's described above may not true anymore.

You can easily measure the current the motor is drawing by removing the fuse and clipping a 20 A ammeter in it's place.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked