1991 Volvo 740 AC Cycles On and Off

VOLVO 740
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PAT BROWN
  • MEMBER
  • 3 POSTS
:? we just picked up a 91 Volvo 740 turbo and we can't get the air cold. the pressure seems to OK but the pump cycles on and off about every 15 seconds, tso the pressure is only sustained for very short periods. any ideas
Jul 3, 2006 at 10:17 AM
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2CARPRO JACK
  • ✓Experienced Mechanic
  • 11,533 POSTS
cycling switch or the pressure is too low
Sep 12, 2006 at 10:30 AM
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MRTANGOGUY
  • MEMBER
  • 11 POSTS
you should service the system to make sure you have about 2.0 lbs. of 134A freon in the system and of course check for leaks
Dec 4, 2007 at 8:33 AM
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Suggested Repair

Check the A/C cycling switch and system pressure, since low pressure can make the compressor cycle about every 15 seconds. Service the system, confirm the refrigerant charge, and check for leaks.

Conversation Summary

The owner of a 1991 Volvo 740 Turbo said the air conditioning would not get cold. Pressure seemed acceptable, but the compressor cycled on and off about every 15 seconds, so pressure was sustained only briefly. The expert suggested a faulty cycling switch or pressure that is too low. Another reply recommended servicing the system, confirming about 2.0 lbs of R-134a, and checking for leaks.

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