Yet another A/C problem. Condenser fan?? - PeachParts Mercedes-Benz Forum

hookedup4door · #1 07-02-2006, 11:43 PM

So my a/c is not working right. It seemed to be blowing cooler air a few days ago but now it's not really getting cold at all. I can hear a click when I hit the a/c button so the compressor seems to be turning on. The switches are acting up though because sometimes the fan works and sometimes it doesn't. This is on a brand new blower motor btw. I'm wondering about the condenser fan though. Is it supposed to turn on as soon as the a/c is turned on? I checked it tonight just by turning the car on and then turning the a/c on. The condenser fan never turned on after a couple of minutes. Does it turn on by a certain temperature or should it cut on imediately? Thanks for the help.

redassag00 · #2 07-03-2006, 12:04 AM

IIRC the Fan will turn on if the Temp reaches really high (95c or something)
And if the AC is on, theres a switch that will cut the fan on if the pressure gets to a certain level in the AC system.

THeres a way to jump the cables to test it.

JimmyL · #3 07-03-2006, 12:08 AM

Quote:

Originally Posted by redassag00

IIRC the Fan will turn on if the Temp reaches really high (95c or something)
And if the AC is on, theres a switch that will cut the fan on if the pressure gets to a certain level in the AC system.

THeres a way to jump the cables to test it.

The switch for the aux fan is on the rec/dryer, and it is temp activated. The temp of the freon closes the switch as I understand it, which completes the circuit to the aux fan.
If not enough freon, for example, you can't get the reaction/heat for aux fan activation.
Of course, I could be incredibly wrong......

redassag00 · #4 07-03-2006, 12:24 AM

I stand corrected!
thanks for clearing that up Jimmy
I knew it operated something that had to do with the freon to kick the compressor on!!

hookedup4door · #5 07-03-2006, 12:33 AM

hmm, so that's probably not my problem.

JamesDean · #6 07-03-2006, 12:38 AM

i think i have some kind of problem involving my aux fan on my 82 SD. The one day i went to start the car and it was dead. not completely but did not have enough power to start.

i checked the amp draw on the battery. i believe it was .72amps.

i started pulling the stuff i've added to see if was somthing i added that caused the drain. it wasnt.

i started to pull fuses and test. when i pulled the fuse for the AUX FAN the power drain went back to normal ~.02a.

when i reset the fuse the power drain was .02a

I believe the aux fan to be the problem but its apparently intermitent....

any ideas?