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10th April 2021, 13:04 | #1 |
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CDTI aircon
Hi all,
The air con on my 75 CDTI packed up last summer. I never got round to looking at it until today. I have a DELPHI DS150 car diagnostics reader. I plugged it into the 75 and checked a few things out. I can test the radiator fan and both speeds are working correctly. When I click on test the compressor, nothing is happening, not even a click of any sort. Any ideas ? Thanks. Pete. |
10th April 2021, 13:44 | #2 |
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The test you are doing is for the AC compressor clutch yes?
Even if the AC system is out of gas, you should still hear the clutch 'kick in' at least (during the component test). So, I would be checking power to the compressor & working your way back. If you have power at the compressor, I would say the actual compressor has failed or the compressor clutch has seized. |
10th April 2021, 15:05 | #3 |
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Hi Pete,
I'd suggest that you put your diagnostics reader away and do the standard checks.
Simon
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"Whatever is rightly done, however humble, is noble." Sir Henry Royce. Last edited by SD1too; 10th April 2021 at 15:09.. |
10th April 2021, 16:38 | #4 |
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Simon, When doing that test the clutch does not engage. I have not measured the voltage on that red wire, I will and let you know.
Pete. |
11th April 2021, 10:14 | #5 | |
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Quote:
Far better to do the test the OP has carried out Simon. That way you are directly testing the component you want to check out, and if it doesn't engage it can only be the clutch itself or the supply to it. |
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11th April 2021, 10:51 | #6 |
Posted a thing or two
rover 75 cdti(rhd), MG ZR(lhd), MG TF(lhd), MG TF(rhd), mini mpi (lhd), Renault megane III (awful) Join Date: Mar 2014
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Mike, even if the system is low on gas, the clutch would engage with this test?
Pete. |
11th April 2021, 11:12 | #7 | |
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Quote:
Please continue with the three points I gave you. If you see +12v at the compressor clutch then that will confirm a fault, but I think the most likely scenario is that your system is low on refrigerant gas. Simon
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"Whatever is rightly done, however humble, is noble." Sir Henry Royce. Last edited by SD1too; 12th April 2021 at 07:11.. Reason: Clarifying that, as stated, I am not referring to use of diagnostic equipment. |
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11th April 2021, 17:55 | #8 | |
This is my second home
MG ZT260 SE, MG ZT190+, MG ZTT 160, R75 Conn SE 2.0, R75 Conn SE 2.5 X 3, R75 Club SE 1.8, P5B Coupe Join Date: Jul 2009
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Quote:
I use a Snap On Modis Ultra & this test does work with ignition on/engine off when doing a component test even with a system that is low on gas (too low to allow the A/C system to operate normally). Also works on a Triton that I'm 'test driving'. |
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11th April 2021, 18:59 | #9 |
This is my second home
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12th April 2021, 07:25 | #10 | |
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Quote:
Pete has already performed the manual diagnostic clutch check hasn't he, and the result was no response. You've said that this indicates either a clutch fault or no supply to it. I'm sure we both agree that it would be sensible that the next step is to check for the presence of a voltage and that is exactly what I have recommended to Pete. His Delphi DS150 cannot do that for him. So Pete we're waiting for you to get out your multimeter! Simon
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"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
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