14 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHAC compressor not turning on
Leading reported evidence
Check clutch fan itself
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
Unsuccessful attempts
1
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Performed · outcome unconfirmed · Original poster
I've checked the clutch fan itself and ran 12 volts directly to it and it engages, so I've ruled out the compressor being bad.
Leading evidence: 'Check clutch fan itself' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check clutch fan itself' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
Installed a used pressure switch from a car that had working AC.
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Performed · outcome unconfirmed · Original poster
I've checked the clutch fan itself and ran 12 volts directly to it and it engages, so I've ruled out the compressor being bad.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
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14 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
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As the title says my compressor is not turning on. Here's what I've checked so far and found out:
I've checked the clutch fan itself and ran 12 volts directly to it and it engages, so I've ruled out the compressor being bad.
I've checked the AC compressor relay and fuses and confirmed it's working and power is being sent through it.
I've tested the wire that connects the AC compressor and my multimeter was not picking up any volts going to it so unsure about this and where to start besides relays/fuses.
Does anyone have any ideas on what to check next? And does anyone specifically know if the AC Pressure Switch went bad, would it prevent the compressor from turning on? I'm thinking about switching that out next as it's easy to get to and relatively cheap to buy new.
Any help is appreciated!
The wire that connects to the AC compressor, and the one I tested is showing 0 - 0.02 volts when tested with a multimeter. (Car was on when tested)
You have 12V at the relay but not at the compressor? Undo the two engine bay wire couplers (passenger side) and spray it with electrical cleaner, the pins and the sockets. Get a new AC compressor relay to eliminate that. Under the carpet behind the drivers seat on the shelf.
Yes if the low pressure swich is bad or reading under the psi it will not allow the compressor to turn on. A durametric can read the swich. Im pretty sure the ac relay is switched via a ground signal but not sure if its from the hvac contol unit or the dme. Get a Bentley manual as it will have the wiring diagrams so u can start testing curcuits
Small update:
The relay is good, I've changed it with a brand new one I was able to source.
Tested my radiator fans and the driver side does not turn on the low-speed setting so changing out the resistor.
Installed a used pressure switch from a car that had working AC.
After the fan resistor is changed out I'll take it to the shop and try to re-gas the system and see if it works. Still have 0 volts at the AC compressor connector wire, but will check again after the resistor is changed out.
Jump the ac relay and if the clutch locks then the wire path is good. At that point the dme is not sending the ground signal to the relay so there is a fault condition telling it to not engauge.
