Hello, I have a
2006 Cayman S
and my AC is not blowing cold air. I have checked the fuse and relay (both are good). I believe the compressor is not running.
Icarsoft
shows error code C144, 8001, P0645. Can someone provide some advise on the cause of this issue. Any help will be appreciate. Thank you.
I copied Don’s ******** response since it’s super helpful (and relevant to my 06
Boxster
whose AC isn’t working either).
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I notice the two bottom screen captures show that there are additional pages of info available (ie 1/2, 1/4) it might be interesting to know what that info is. Since you have a
987.1
your AC does have a clutch. The clutch is opened/closed by a relay in response to the cooling
ECU
. Questions I would have are:
1. Can I hear the relay open/close?
2. If not - does it work if I replace the relay?
3. If it does make a click for open/close - do I have 12.6V at the input side of the switched terminals (
voltmeter
needed)?
4. If it does make a click - do I see 12V at the output terminal of the relay?
5. If #4 is true - do I see 12V at the input connector for the clutch?
6. If I do see 12V at the input connector for the clutch, disconnect the connector to the clutch and use an Ohmmeter to read the resistance of the clutch coil. If its "infinity" (0.0) then the clutch coil is likely kaput. That can be changed without removing the compressor or venting the system to air.
That's the start for diagnostics. I'd also check if the system had gas in it (a refrigeration gauge connected to the high/low side ports. Lack of gas can cause prevent the system from working since there is a safety switch that shuts the system down if there isn't any refrigerant in it.
I did have a Freon fully charged last week at a shop. I will start looking into the possible cause above. Thank you.
I should correct one thing - when measuring the continuity of the clutch coil, if it's shorted it will read 0.0 Ohms. If it's open (more likely) it will read the same as when the probes aren't connected to anything (some very high number, which is basically the internal resistance of the meter being used.)
I guess I should correct this on ******** (easy since I'm a mod there..
)