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Old 06-25-2006, 09:00 PM
DonB DonB is offline
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Join Date: Oct 2005
Posts: 128
How do I test the condenser fans on my 1999 C230?

I just replaced the condensing coil on my 1999 C230's a/c system and now the a/c works better, but not great. Air coming out of the vent is just under 70 deg-F. I watched the condenser fans and they never come on, so I did some testing:

- With the car running, a/c turned on, compressor running:
- Removed each fan connector and checked - 0 volts
- Did continuity check on each fan (at the connector) - open circuit on both
- Disconnected wires at high pressure switch - compressor turns off
- Ran wires from battery (in trunk) directly to each fan - nothing happened (but the wires I used were not very good, might have been a bad connection)

Is everything broken, or did I do the tests wrong? What is the right way to test the fans? Thanks everyone, suggestions greatly appreciated,

Don

PS - The pressures are Hi side = 215 ; Low side = 30 (ambient about 75 F)
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