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1991 740 Wagon AC Compressor cycles on momentarily 700

posted by  jimnau on  Mon May 10 14:16 CST 2004
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last visit: Sun Jul 6 09:52 CST 2014
[RELATED]

I agree with Jim McDonald's diagnosis....compressor is cycling too fast because you are low on A/C refrigerant--the low pressure switch cuts out the compressor so it is not damaged by lack of lubrication ....same symptom I had two years ago....I discovered a leaking A/C condenser....carefully examine all A/C connections, lines, hoses, etc. and look for oil spots.....

If your '91 740 wagon is like my '91 740 sedan, the electric fan in front of the A/C condenser does not run continuously when the A/C is on. The fan is activated by the coolant temperature switch in the radiator (top left side of the radiator as you face the car). To test the electric fan, disconnect the two leads to the switch and touch them together....fan should come on. If it does not, switch, relay, or fan is bad.

The electric fan in my car rarely comes on....I live in NC, so it gets plenty hot here.

Hope this helps some,
Jim Nau
'91 740, 130K
--
Jim Nau






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