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20th June 2019, 15:09 | #21 | |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,412
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Important note about compressors
Quote:
Don't forget that in the event of refrigerant pressure rising to an excessive level due to lack of fan assistance, the trinary switch will disengage the compressor clutch which prevents damage. Simon
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"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
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20th June 2019, 15:51 | #22 |
This is my second home
Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009
Location: Hampshire
Posts: 11,557
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Has anyone come up with an answer as to the origin of the noise?
All I can think of is it being either a pressure relief valve, or the compressor being driven in reverse by the pressurised refrigerant once the trinary switch disengages the clutch. The compressor is a Williams Janney style constantly variable positive displacement pump, so if there was enough pressure on the pistons they could be driven back if the swash plate was still at an angle to the block. |
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