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#1
03-13-2007, 01:08 PM
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Erratic A/C
This is concerning the A/C on my Xterra.
When I turn the A/C on, it doesn't blow cold. After a while (2 minutes) it starts getting cold. Then the temperature of the air out of the vent starts to fluctuate - it gets nice and cold as it should be and a couple of minutes later, the temp of air out the vent goes up then back down again. Just wondering what is going on - is the system just low on freon or is the compressor not able to keep up or is the belt slipping? Thanks.
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1986 300E (3/2002) Rear ended and totaled (10/2009) 2000 Xterra (5/2000) 1992 400E (11/2009) -Sold 1986 300E (12/2009) - Sold 2004 E500 Wagon (6/2013) - Sold 
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#2
03-13-2007, 01:21 PM
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Probably a restricted expansion valve. The only way to know for sure is hook gauges up to the system and monitor the pressures. That will tell you if its a freon issue or an expansion valve issue.
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81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.
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#3
03-14-2007, 08:12 AM
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You need to find the sample blower motor and see that it is running. It is in varying locations thoughout the 124 series, but start looking by pulling the glove box and looking forward and to the right.
This little fan should be turning any time that the ignition switch is in the on position. If it is not turning, the CCU is not getting a reliable temperature reading and will act as you describe. Good luck,
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#4
03-14-2007, 07:57 PM
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Thanks for the replies.
Larry - the A/C problem was on my Xterra - Just got it fixed. The thermister went bad on it. Replaced and so far so good.
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1986 300E (3/2002) Rear ended and totaled (10/2009) 2000 Xterra (5/2000) 1992 400E (11/2009) -Sold 1986 300E (12/2009) - Sold 2004 E500 Wagon (6/2013) - Sold
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Linear Mode
