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Old 03-18-2018, 03:01 PM
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Join Date: Mar 2018
Posts: 1
Question 1994 E320 AC woes

Hi all,

Car has 73K original miles.

Recently, AC selected- blows warm air. ( sudden onset )

Drove it home and parked it overnight.
When I started it the next day AC worked fine initially.

Shut off and restarted and back to blowing warm air.

Drove it around for about 30 minutes and returned home with no joy.

( OAT about 80 F )

Popped the bonnet and noticed that the aux fans are not coming on with AC selected and engine running sitting in the driveway. ( warm engine and warm outside )

So far, checked fuses ( aux fan and relay fuse ) and removed and re-plugged both relays.

Checked all connections and wiring that I could see, including thermostat, resistor and dryer connections.

Don't want to start throwing electrical parts at it until I narrow down the issue a bit.

Any troubleshooting help would be appreciated.

Rob in Austin TX
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