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Altezza a/c problem

auagen on Thu March 08, 2012 6:48 PM User is offline

Year: 1999
Make: Toyota
Model: altezza
Engine Size: 2.0
Refrigerant Type: r134
Country of Origin: Aruba

Hi, I have bought a toyota altezza 1999 and I saw that they put a ground wire from the a/c compressor relay to the blower.
When I take it off, the compressor turns off and the a/c switch start blinking.
Me and my friend jump the pressure switch , nothing happens
We dicharge the system, vacuum it, put new gas in it, but has still the problem.
What else do i've to check?

mk378 on Fri March 09, 2012 11:44 AM User is offline

I'm guessing it has an "A/C Amplifier" like many older Toyotas did. This system engages the compressor, then a couple of seconds later it checks the compressor rpm to see if it is as expected relative to the engine rpm. If not, it disengages and goes to a lockout mode where the light starts blinking. I think (besides just a desire to make the car excessively complicated) the intention was to prevent the belt from breaking if the compressor has seized.

Make sure that everything is wired back as stock. The pressure switch should test closed circuit when there is pressure in the system. Observe whether the compressor engages at all when you first press the button. If it engages for a couple of seconds then stops, there's a problem with the rpm sensor or the amplifier. If it doesn't engage at all, it could be the fuse, relay, or amplifier.

Many times a "bad" amplifier just has bad solder connections inside.

Edited: Fri March 09, 2012 at 11:46 AM by mk378

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