A/C Electrical Help????

Mike Andrew · 07-21-2019, 10:51 AM

I need some electrical help for my A/C. It was running fine and just stopped while fan was on high.
Here's what I have done: ( I am basically an electrical idiot and must have worked for Lucas in a previous life)
Fuse- first thing checked.
Relay switched with known good relay
Fan Blower switch swapped for known good switch. Bentley pretty much points here

Verified voltage to fuse block
Verified continuity in resistors in footwell
No blower motor function still and I do not believe the clutch is engaging.

Still no go. So:
How do I jump the blower motor to verify it is functional or meter check it?
How do I verify there is power to the switch - which terminals do I check? I assume that if the switch has power the problem is between the switch and blower

And where else and how else to check the system? Bentley is not exactly definitive for troubleshooting the system electrically.

Like to have it functional before IMSA at Road America in 2 weeks and just be able to drive it comfortably.

86 911 Targa · 07-21-2019, 11:06 AM

^^^^^

This will shut down you A/C.

Did you check both sides of the fuse?

pm me as needed.

Best,

Gerry

Mike Andrew · 07-21-2019, 11:44 AM

Have continuity thru fuse and holders so I assume the fuse is good.

Mike Andrew · 07-22-2019, 04:33 AM

Bump.

RAW911 · RAW911's Garage

Did someone add an evaporator relay and fuse?

PS: Photo stolen from 86 911 Targa

86 911 Targa · 07-22-2019, 06:44 AM

Quote:

Originally Posted by Mike Andrew

Have continuity thru fuse and holders so I assume the fuse is good.

Do you have 12v on both sides of the fuse
when the A/C is active?

Gerry

pm me as needed.

Mike Andrew · 07-22-2019, 07:00 AM

SOLVED!!!!!!!
Thanks to Raw911 and the rest of you for your assistance.
It was the evaporator fuse which I replaced and Voila!!!!
As I was doing it, I remembered replacing it long ago and how tight it was to get the fuse in with my giant hand in there with the correct angle for fuse placement.
Man, I feel like an even bigger electrical idiot now. However, I aspire to be an electrical moron in the future

Cleaned out a big mouse nest from the Smuggler's Box which could possibly have impeded airflow and led to high current draw. We shall see as I use the system. Man, I hate freaking mice. I fight them at my place in N. Wisconsin and now, here. Not enough owls, hawks and wolves.