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AC compressor will not engage 850

posted by  Rockytop on  Thu Jun 23 17:32 CST 2005
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last visit: Tue May 10 13:59 CST 2011
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1) "climate controlled car" -- I guess you mean that it has the Electronic Climate Control (with the temperature dial w/ numbered degrees)?
If so, are you getting any a/c fault codes?
Does that a/c fan stay on 100%, even when the whole a/c system is set to off (ie, not on automatic)?
2) Do you remember what the low-pressure reading was? Ballpark?

Here's Volvo lit for the Elect.ClimateControl (ECC):

"The a/c relay (is) activated by both the ECC module and the Eng.Control Module (ECM). The ECM turns a/c comp. off when engine is at full accel, at high eng. temp, and for 5-10 seconds after starting engine."

3) Is your engine temp. OK on the instrument panel gauge?
4) Is your Radiator Fan coming on within seconds of turning the a/c on? If not, it's still not conclusive b/c the same problem (non-Radiator Fan problem) could be causing the a/c AND the R. fan to not work. Does the R. Fan come on when engine temp gets high (after summer idling / driving in city for a while)? You may have to test the R.Fan and its relay if you aren't sure.






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New AC compressor will not engage [850]
posted by  lhend  on Mon Jun 20 13:03 CST 2005 >


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