2003 BMW X5 A/C

KAIZDAD

MEMBER
2003 BMW X5
6 CYL
77,000 MILES

On the low pressure switch there are 3 wires. Which ones do I have to jump to get the compressor to kick on?

Saturday, January 29th, 2011 AT 11:45 PM

5 Replies

WRENCHTECH

MECHANIC
20,757 POSTS

You don't want to jump anything there. That is not an off/on type of switch. It's a sensor that feeds data to the computer. If you put a minimal amount of refrigerant in it and reset the computer, it will energize the compressor if it doesn't have any other problems.

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Sunday, January 30th, 2011 AT 12:07 AM

KAIZDAD

MEMBER
3 POSTS

Thank You for your help wrenchtech. To reset computer do I just disconnect battery for two min or is there an alternative method on theses vehicles?

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Sunday, January 30th, 2011 AT 12:43 PM

WRENCHTECH

MECHANIC
20,757 POSTS

Disconnecting the battery should be sufficient but don't do that unless you have to because you will lose all the other memory also.

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Sunday, January 30th, 2011 AT 12:45 PM

KAIZDAD

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3 POSTS

Thank You for your help.

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Sunday, January 30th, 2011 AT 12:58 PM

DOCHAGERTY

MECHANIC
9,601 POSTS

The response from Wrenchtech is correct and I agree with it. The lack of refrigerant is the cause, the IHKA system will see the logic from the pressure switch and begin to work if there is enough refrigerant in the system, it won't require a reset. A/C systems require special tools and equipment to be serviced correctly. They also operate at high pressures and repairs should be done by trained technicians.