A/C Troubleshooting with PFC
#1
A/C Troubleshooting with PFC
Here is what I've got going on. I replaced the orings, baked the reciever/drier, checked for leaks, vacuumed and charged the system with the amount reccomended by one of the vendors here.
The a/c works GREAT, when it is operating that is. The car runs cool and passes with the wife's seal of approval.
The issue appears to be the "A/C signal" to the PFC, is the switch/sensor check screen the little dot does not stay solid with the A/C button on. IT does seem to work better at lower fan speeds and stay on longer periods of time.
I remember a thread talking about this exact problem, with a ground being a possible solution or a new fan speed switch.
I have tried searching for it with the search function, but I have been unable to find it either due to a failure in searching or my own, lol.
Thanks!
Vince
The a/c works GREAT, when it is operating that is. The car runs cool and passes with the wife's seal of approval.
The issue appears to be the "A/C signal" to the PFC, is the switch/sensor check screen the little dot does not stay solid with the A/C button on. IT does seem to work better at lower fan speeds and stay on longer periods of time.
I remember a thread talking about this exact problem, with a ground being a possible solution or a new fan speed switch.
I have tried searching for it with the search function, but I have been unable to find it either due to a failure in searching or my own, lol.
Thanks!
Vince
#6
hi, mind to share how does it look like? also, where can i get it? do u think i dismantle from those 99 spec half cut will work for those 91 spec FD3S?
#7
Rotary Enthusiast
iTrader: (32)
I also used dielectric grease on the plug contacts to minimize resistance there, too. I have started using this on all the contacts of my FD as I service or repair something. This car has one of the weakest, worst electrical systems of any car made in the last 30 years probably!
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#9
I forgot to reply with my findings. I took my fan switch apart and the copper inside was green! I polished it up until it was shiny and reassembled it with dielectric grease.
Afterwards, I now have a solid A/C indication in fan speeds 1, 2 and 4. 3 does not show up at all. the issue must be elsewhere in the dash harness. I'm thinking it must be one of the grounds. The fan itself is also kinda wimpy, so it leads me to believe it has poor ground.
I will need to remove dash to see why I do not have heat, I think the blend door is broken. So, while I'm in there I'll address all of those grounds and disassemble the blower fan to service the brushes and lube the bearings.
Vince
Afterwards, I now have a solid A/C indication in fan speeds 1, 2 and 4. 3 does not show up at all. the issue must be elsewhere in the dash harness. I'm thinking it must be one of the grounds. The fan itself is also kinda wimpy, so it leads me to believe it has poor ground.
I will need to remove dash to see why I do not have heat, I think the blend door is broken. So, while I'm in there I'll address all of those grounds and disassemble the blower fan to service the brushes and lube the bearings.
Vince
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