Originally Posted by Greg Sabol (Post 12428337)

Thanks for the reply AE.... My FD is a 1993 USA east coast...The AC thermoswitch is in the Mana Design evaporator. The Mazda part # for the thermoswitch is FD01-61-J20. This part is discontinued, but with all the AC units out there it's hard to believe there isn't another Thermoswitch that would fit. My AC is working well with the Thermoswitch jumped. To replace the thermoswitch involves removing the evaporator box and disassembling it, because of the long thermoswitch probe tube....it's a pain!

Originally Posted by mpk490p (Post 12428336)

so when you jumped the AC relay and the clutch pulled in you had ac again? I did that to mine but it still doesn’t blow cold even with the clutch engaged :( it was pressure tested and refilled the other week and I can see movement of gas in the peep hole on the dryer???

Originally Posted by Greg Sabol (Post 12428418)

That stumps me....there's something else going on there. If the clutch kicks in, and you see the gas move,....does the fan switch work?

Originally Posted by linnadawg (Post 11077203)

My A/C would only work on speed 1 and sometimes 2. I followed these instructions. R12 feels amazing.



Category Five Motorsports

Power-FC A/C MOD

This mod will enable your air conditioner to work when installing a Power FC in FD3s. This will also fix the problem of the a/c not working on one or more of the fan speeds.

The reason the a/c does not come on is because as the car ages, the ground signal going to the ECU’s (wire 1E) is receiving a fuzzy ground signal. Some cars have no problem with the signal, but some do; the last FD I worked on the a/c did not work on any speed. My mod will interrupt the signal going into the Power FC and redirect it through a simple Bosch relay. This will also let the Power FC still control the IAC and switch the a/c off at wide open throttle.

Locate wire 1E (Violet wire) - it is the third wire from the end on connector one. Cut the wire 2” from ECU. On the harness side you will hook 1E to (86). On terminal (85) on the relay will go to ignition +. Terminal (87) will go to 1E that was cut on the Power FC side. Terminal (30) will go straight to chassis ground. Now when your a/c is turned on, it will receive a nice healthy ground. If you have any questions contact me via email.

Freddie@catfivemotorsports.net

Originally Posted by touki (Post 11874780)

I am still having issues as I have a 2001 model and the pin layout is different to the 93-94 spec cars which is the only wiring diagrams I can find.

I did the mod as per the instructions, Using the only violet wire in the harness, but the relay isn't being activated.

I figured out the wire that runs to the relay Yellow/Black stripe, but I am not 100% sure that the violet wire is the right one, as it is on a different connector.

If I can activate the relay then we are all good. I am considering just putting in a manual switch. Really frustrating especially when it is summer here in Australia.

Originally Posted by Greg Sabol (Post 12601043)

I did the relay mod it worked for awhile.......then the thermoswitch had to be jumped to get it to work......It's April 2024 now......The A/C isn't working again....All the fan speeds work, the A/C clutch doesn't come on anymore, A/C relay tested OK, Clutch works when jumped to + , thermoswitch jumped....can't get the clutch to engage....I removed the relay mod and just did a direct connection.....1E to 1L on the harness side, this bypass's the PFC ECU. Still no A/C....I'm stumped again! This A/C problem is such a pain, no A/C in Florida summers makes driving the FD no fun!