A/C and fan issues
#1
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I have 2005 Civic LXG
A/C works great except it never shuts off, whether the A/C button is on or not. My mechanic has looked at it twice and can't find the problem??? He thinks that it might be a defective button/ switch on the dash.
In the summertime the A/C runs until it basically freezes up and vapour comes out of the vents and then nothing comes out of the vents at all.
Since then we replaced the relays with ones from a different car. No change.
I pulled the A/C relay because I live in Ontario and its November. Now my cooling fan runs non-stop, even at cold start up. Tonight I looked at it and I'm pretty sure the compressor fan is running non stop as well.
Has anyone experienced this issue? Or could clue me in to the possible issue.
A/C works great except it never shuts off, whether the A/C button is on or not. My mechanic has looked at it twice and can't find the problem??? He thinks that it might be a defective button/ switch on the dash.
In the summertime the A/C runs until it basically freezes up and vapour comes out of the vents and then nothing comes out of the vents at all.
Since then we replaced the relays with ones from a different car. No change.
I pulled the A/C relay because I live in Ontario and its November. Now my cooling fan runs non-stop, even at cold start up. Tonight I looked at it and I'm pretty sure the compressor fan is running non stop as well.
Has anyone experienced this issue? Or could clue me in to the possible issue.
#2
If you think a good mechanic is expensive, try hiring a bad one
Re: A/C and fan issues
My mechanic has looked at it twice and can't find the problem??? He thinks that it might be a defective button/ switch on the dash
A problem like you describe (always present) should be EASY to figure out, but one needs to be proficient with electricity and have understanding of the systems involved first.
Electricity is like the final frontier of car repair. Many mechanics just never grasp the concepts.
I pulled the A/C relay because I live in Ontario and its November. Now my cooling fan runs non-stop, even at cold start up.
Disconnect the A/C pressure switch, or disconnect the 3 wire connector from the compressor.
If the fans stop running all the time, this probably indicates a bad HVAC control unit (or a wiring problem causing the same effect). Reconnect whichever you just unplugged.
Pull out the HVAC panel from the front of the dash.
Disconnect the HVAC controller plug and see if the AC shuts off now. (HVAC controller bad is common, but your failure isn't the normal symptom I usually see.)
If disconnecting the compressor connector or pressure switch connector did NOT get the fans to stop, then you could have a multiplex controller problem or something else....then I would go testing.....following a wiring diagram with a voltmeter, and using a scantool to see what the PCM is doing, since it has control of the compressor clutch relay.
HTH
#4
If you think a good mechanic is expensive, try hiring a bad one
Re: A/C and fan issues
IDK, I never considered if it would be easy or not. I just said to disconnect as a test.
A wiring diagram would show the "why" part of this.....or it might look like spaghetti dinner to most people.
HTH
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