1992 190E AC Question - Page 2 - PeachParts Mercedes-Benz Forum

meltedpanda · #16 05-12-2007, 11:01 PM

does this have any connection to the temg sender,I noticed tonight that it went up to 80 C and then back down to 40C in 84 degree heat running at idle for 25 minutes
I have 7.5 v at the single plug is this correct?
I cannot get continuity through the other two no matter how hot the car gets, is it linked to another circuit?

slk230red · #17 05-13-2007, 12:08 PM

Are you stating that the aux. fans are not operating when the A/C is on?

If so, have you checked the aux. fan switch at the A/C receiver/dryer? There are 2 switches on the dryer, one for the freon pressure to shut off the compressor if the high pressure gets too high, and one for the aux. fans (this is the one with the pigtail). This one could be the one that is not turning on the aux. fan when the A/C is on.

Keep in mind that the aux. fan serves 2 purposes...
1. to cool the radiator when needed.
2. to cool the A/C condensor.

brewtoo · #18 05-13-2007, 12:10 PM

Quote:

Originally Posted by meltedpanda

does this have any connection to the temg sender,I noticed tonight that it went up to 80 C and then back down to 40C in 84 degree heat running at idle for 25 minutes

Are you sure it went back down to 40C? A properly functioning thermostat should not allow that.

meltedpanda · #19 05-13-2007, 12:51 PM

Are you stating that the aux. fans are not operating when the A/C is on?

the aux fan only comes on if I short it out, will not run otherwise, with AC on or OFF, is there a way to check the other switches, and can the temp gauge sender have a part in this whole isue? THanks guys

slk230red · #20 05-13-2007, 02:24 PM

Quote:

Originally Posted by meltedpanda

Are you stating that the aux. fans are not operating when the A/C is on?

the aux fan only comes on if I short it out, will not run otherwise, with AC on or OFF, is there a way to check the other switches, and can the temp gauge sender have a part in this whole isue? THanks guys

Sure, just short the 2 wires at the dryer switch to see if the aux. fan operates like you did at the temp. switch.

meltedpanda · #21 05-13-2007, 10:01 PM

does not come on with shorting the two pigtails together on the drier - should it just run ? , Hmmm what could that mean?There is another switch of sorts there as well, kinda in front and to the left of the drier, two clip on type connections
temp gauge is irradic, but does not seem to have much effect on this whole deal

Arthur Dalton · #22 05-13-2007, 10:12 PM

I assume you are jumping the pigtail wires while they are still plugged into the sensor...and you hav the key ON
If so, then first check is fuse for low fan and the second look see is the wires at the dropping resistor.

meltedpanda · #23 05-14-2007, 11:17 AM

If I told you , you probably won't believe me.After going through all the test you guys told me and consulting with an AC guy, I decided that all the components of the AC system including the fans were good. Sooooo I looked for a short or an intemitent connection and I found it - shorted out wire to the electric nozzels for the winshield, on the same circuit as the aux fan, rewired - all working now - thanks - I still have irradic temp guage readings - any ideas - dare I ask
Thanks again