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Discussion Starter · #1 ·
Can anybody help please. I have a 1998 V70 T5 whichI have just bought. The aircon isnt working. the light on the dash comes on if I press it but the clutch on the aircon compressor doesnt cut in . I am hoping this may be an electrical problem but are there checks I can go through to find where problem lies. Thanks
 

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You might be low on freon.Under the hood in the A/C pipe by the body of the car is a low pressure switch.You can unplug the connector and jump the 2 wires.Listen fro the compressor to come on.If it does then see if it is blowing cold if not then you are low on freon.That is a low pressure switch and if you are low on freon it will not turn on.
 

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Discussion Starter · #3 ·
Hi Tech - many thanks.

Tried jumping all connections but compressor wont come on.
any further info would be apprecited.

cheers
steve
 

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Discussion Starter · #4 ·
Actually might have been in wrong place. If I jump connections on Pressostat pressure switch at back of engine bay compressor fires up but no cold air. Does that mean I have no freon - or could we be in the realms of a leak like I had on my old V70 which turned out to be a punctured pipe.
 

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You are either low or empty on freon.
Try putting some in and listening for a leak while putting it in.
 

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Discussion Starter · #6 ·
Sounds like a specialist job - dont they evacuate system to test for leaks then let it in under the vacuum.

steve
 

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They do but if you want to make sure it has a leak or not install dye and some freon do that first and then if it leaks out pretty fast have someone else look at it.
They can also look for the dye and tell you where the leak is.

A small leak is hard to find during the vaccum process.
 

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QUOTE(steve1000 @ Jun 12 2005, 06:27 PM)Can anybody help please. I have a 1998 V70 T5 whichI have just bought. The aircon isnt working. the light on the dash comes on if I press it but the clutch on the aircon compressor doesnt cut in . I am hoping this may be an electrical problem but are there checks I can go through to find where problem lies. Thanks
[snapback]9494[/snapback]​


if you are saying you watch the compressor and it is NOT actually turning, ie clutch is not engaging then IMHO it is elect prob albeit that it could be an actual LP/HP etc induced [ie intentional] cut out in the circuit from on switch to clutch [and I assume it is a 2 part circuit ie via relay so problem could be relay itself]

first thing is put multimeter on clutch positive to see if 12V there [like the clutch itself can burn out] - but if zero volts start checking backwards [helps if you have a wiring diag for the vehicle of course]
 

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QUOTE(The Doctor @ Jun 12 2005, 07:35 PM)if you are saying you watch the compressor and it is NOT actually turning, ie clutch is not engaging then IMHO it is elect prob albeit that it could be an actual LP/HP etc induced [ie intentional] cut out in the circuit from on switch to clutch [and I assume it is a 2 part circuit ie via relay so problem could be relay itself]

first thing is put multimeter on clutch positive to see if 12V there [like the clutch itself can burn out] - but if zero volts start checking backwards [helps if you have a wiring diag for the vehicle of course]
[snapback]9517[/snapback]​


But if you read further he figured out it is low on freon and the low pressure switch is preventing the compressor from coming on.
 

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Discussion Starter · #10 ·
thanks for info - yep compressor engages when circuit jumped so low pressure switch is reason for non function of compressor. However the reason for low pressure in the first place could be low/zero freon in system and thats where I need to get a leakage test as it could be a just in need of a re-charge or worse there could be a pipe/seal/compenent failure.
thanks
 
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