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AC – Installed electric fan, now compressor cycles on&off – doesn’t cool well 700 1986

posted by  someone claiming to be slong on  Sat Jul 13 10:10 CST 2002 [RELATED]


My 86 740GLE has an electric fan in front of the condenser that is activated by a termoswitch in the radiator. I installed a relay that bridges this switch to turn on the fan whenever the AC is on. Now the compressor clutch engages for about 5sec and then disengages for about 5 sec at 2000RPM. The pressure switch at the evaporator is opening and closing. Does this mean that the charge is too much? Too little? The system has been converted to R134a by a Volvo dealer (it has a new evaporator).

Thanks,
Steve







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AC – Installed electric fan, now compressor cycles on&off – doesn’t cool well 700 1986

posted by  chris herbst on  Mon Jul 15 03:05 CST 2002
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last visit: Mon Oct 20 20:32 CST 2014
[RELATED]

2000 rpm.

What are the A/C settings? Outside temperature? The system will cycle under cooler conditions, or conditions where the fan is on a very low setting and it is already cool in the car.

Make sure you establish some of those things before giving it a squirt of R134. If you overcharge a 134 system, your cooling will stink, pressures will go sky high, and you run the risk of blowing something up.

Also, the condenser fan that now runs when the A/C is on, is more effective and will cause more cycling if anything.
--
1992 940 wagon, 72k







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AC – Installed electric fan, now compressor cycles on&off – doesn’t cool well 700 1986

posted by  mark h. on  Sat Jul 13 14:38 CST 2002
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last visit: Wed May 9 03:45 CST 2001
[RELATED]

Add 134.








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AC – Installed electric fan, now compressor cycles on&off – doesn’t cool well 700 1986

posted by  someone claiming to be slong on  Sat Jul 13 10:18 CST 2002 [RELATED]

Sorry, it was the receiver-dryer that they replaced, not the evaporator








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AC – Installed electric fan, now compressor cycles on&off – doesn’t cool well 700 1986

posted by  Oil Eater on  Sat Jul 13 10:25 CST 2002
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Either low on charge, malfunctioning pressure switch, or switch out of adjustment.

Most likely are a little low on charge.







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