Power FC Air conditioning FIX
#26
got mine working - I cut the control wire from the pfc that draws the ac compressor solenoid control circuit to ground and wired it into the Bosch solenoid-to-ground fix that was suggested earlier in this thread. The pfc wasn't pulling a strong ground on 35 in the manual (pin 1L) even with Freddie's solenoid fix. I could have used a second solenoid which would retain the high load compressor cutout which this doesn't. This does retain the pressure and thermo switch control.
#27
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got mine working - I cut the control wire from the pfc that draws the ac compressor solenoid control circuit to ground and wired it into the Bosch solenoid-to-ground fix that was suggested earlier in this thread. The pfc wasn't pulling a strong ground on 35 in the manual (pin 1L) even with Freddie's solenoid fix. I could have used a second solenoid which would retain the high load compressor cutout which this doesn't. This does retain the pressure and thermo switch control.
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.
#28
I tried to contact Freddie too...email must have changed. I had a couple of questions.... the Violet wire, on the 93 controls the AC thermo switch, the Y/B (yellow/black) is the AC ground into the ECU, just wondering why he used the thermo ground and not the AC gound. I don't know how the relay improves the ground, it simply reconnects the wire when the ignition is turned on, can anyone clarify this?
Last edited by Greg Sabol; 05-25-15 at 02:49 PM.
#29
TO anyone that's done this mod....where did you pick up the ignition+....is there any ignition+ going into the ECU....or somewhere close to the ECU.
Last edited by Greg Sabol; 05-26-15 at 01:29 PM.
#30
I did Freddies mod, picked up the ignition+ from the 1B pin on the same ECU harness (fuel injector relay 12v)...the mod worked. Once the car is warmed up the FC isn't raising the RPM with the AC on so the car wants to almost stall (500 RPM). I set the FC AC idle at 1000rpm but it hasn't changed it yet.....may have to drive around for a bit.
Last edited by Greg Sabol; 05-26-15 at 01:26 PM.
#31
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Blower fan levels
How you doing guys.. I have a problem on my fd3s. I turn on the blower on 1st and 2nd level and it turn on the radiator fans.. and the 3rd and 4th work fine.. Is anyone knows how to I fix it.??
#32
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This can be a useful mod, but I just wanted to add that I fixed this problem by replacing the fan speed switch with a new part. Before I did that, I had AC compressor clutch function with fan speeds 1 and 2 only. With the new switch, it is working on all 4 speeds. I also used a little dielectric grease on the switch plug terminals - something I am doing on every electrical connection I touch in my FD now.
Nothing wrong with doing the relay mod, but I wanted to try a fix that did not involve changing the original wiring. For now, it is working. Fan switches are still available AFAIK- about $75 so much more expensive than a relay and some wire I agree, but this seems to resolve the problem without any wiring mods.
Nothing wrong with doing the relay mod, but I wanted to try a fix that did not involve changing the original wiring. For now, it is working. Fan switches are still available AFAIK- about $75 so much more expensive than a relay and some wire I agree, but this seems to resolve the problem without any wiring mods.
Last edited by jza80; 06-23-17 at 11:18 AM.
#33
Senior Member
iTrader: (6)
Bump from the dead just to say thank you to this forum and it’s incredible members!
Fixed my a/c in 15 minutes after searching the forum, thanks to everyones diligence in sharing their knowledge.
Cant even begin to count the number of things I’ve fixed/learned in just a couple minutes of searching over the years here.
Thanks to all!
Fixed my a/c in 15 minutes after searching the forum, thanks to everyones diligence in sharing their knowledge.
Cant even begin to count the number of things I’ve fixed/learned in just a couple minutes of searching over the years here.
Thanks to all!
#34
Senior Member
iTrader: (7)
This can be a useful mod, but I just wanted to add that I fixed this problem by replacing the fan speed switch with a new part. Before I did that, I had AC compressor clutch function with fan speeds 1 and 2 only. With the new switch, it is working on all 4 speeds. I also used a little dielectric grease on the switch plug terminals - something I am doing on every electrical connection I touch in my FD now.
Nothing wrong with doing the relay mod, but I wanted to try a fix that did not involve changing the original wiring. For now, it is working. Fan switches are still available AFAIK- about $75 so much more expensive than a relay and some wire I agree, but this seems to resolve the problem without any wiring mods.
Nothing wrong with doing the relay mod, but I wanted to try a fix that did not involve changing the original wiring. For now, it is working. Fan switches are still available AFAIK- about $75 so much more expensive than a relay and some wire I agree, but this seems to resolve the problem without any wiring mods.
I've confirmed that a new Fan Switch (now $90 from Ray Crowe) fixed my problem. Originally my fan 3 didn't work, then 2 and 4 a year later. After receiving the switch (took a few minutes to install) now all 4 fan speeds work with the AC! I didn't want to mess with the factory wiring until that option is no longer available.
#37
Senior Member
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Sorry to revive an old thread, but all of my searching is turning up nothing. I just installed a Power FC in my 93 touring, and now my a/c only works on setting 1. I took the switch apart and cleaned all of the contacts, and I wired in the relay exactly as shown in Freddie’s how-to, but still no change except that the light in the a/c button on the dash doesn’t flicker anymore. The switches aren’t available new anymore, so that option is out. Is there anything else I can do?
I did have a thought, but I wanted input before I tried it. If the reason the Power FC has trouble is because of a staticky ground signal on the switch, can I just run a new ground from the black wire on the back of the switch, to a clean point on the chassis?
I did have a thought, but I wanted input before I tried it. If the reason the Power FC has trouble is because of a staticky ground signal on the switch, can I just run a new ground from the black wire on the back of the switch, to a clean point on the chassis?
#38
Sorry to revive an old thread, but all of my searching is turning up nothing. I just installed a Power FC in my 93 touring, and now my a/c only works on setting 1. I took the switch apart and cleaned all of the contacts, and I wired in the relay exactly as shown in Freddie’s how-to, but still no change except that the light in the a/c button on the dash doesn’t flicker anymore. The switches aren’t available new anymore, so that option is out. Is there anything else I can do?
I did have a thought, but I wanted input before I tried it. If the reason the Power FC has trouble is because of a staticky ground signal on the switch, can I just run a new ground from the black wire on the back of the switch, to a clean point on the chassis?
I did have a thought, but I wanted input before I tried it. If the reason the Power FC has trouble is because of a staticky ground signal on the switch, can I just run a new ground from the black wire on the back of the switch, to a clean point on the chassis?
#39
Senior Member
iTrader: (4)
I don't see how that could harm anything...worth a try. My problem was compounded by a bad Thermo switch, the one that sends a tube into the evaporator to control icing. I looked all over for a new switch....discontinued. You'd think with all the Denso air con on other cars there'd be a substitute part? I wound up just disconnecting the switch, the AC works on all fan settings now. The only problem would be in colder climates the evaporator may ice up.
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#43
I have a 99 FD I believe the issue is ECU related, basically I get a light on the ac button and I believe the relay is kicking in but I don’t think the clutch does on the AC pump. Can’t see any fluid moving in the peep hole (had the system pressure tested and regassed the other week the guy said it didn’t work at first then it kicked in so just presume it was because it was empty?) I checked the sensor check and when I hit the ac I get the exhaust temp and cat switches light up but not the ac?
Is this the earth issue mentioned here?
car has a decat btw
thanks in advance
Ac off
Ac on
Is this the earth issue mentioned here?
car has a decat btw
thanks in advance
Ac off
Ac on
#45
The Thermo sensor probe that's in the evaporator may be bad...if so the A/C will kick on for a moment, then turn off. Mine was bad, I jumped it and the A/C works fine. I've tried finding the sensor, it's discontinued, a Denso part. I tried cross referencing, you'd think with all the Denso A/C units out there, there would be something that would fit....no luck! The senor is supposed to stop icing of the evaporator....I live in Florida, so I don't think it'd be a problem to just leave it jumped.
#49
The Thermo sensor probe that's in the evaporator may be bad...if so the A/C will kick on for a moment, then turn off. Mine was bad, I jumped it and the A/C works fine. I've tried finding the sensor, it's discontinued, a Denso part. I tried cross referencing, you'd think with all the Denso A/C units out there, there would be something that would fit....no luck! The senor is supposed to stop icing of the evaporator....I live in Florida, so I don't think it'd be a problem to just leave it jumped.
#50