Volvo S70 Made from 1998 to 2000, this sporty model replaced the 850 sedan and instantly became a hit.

99 s70 ac system gone crazy

Old 07-09-2017, 05:47 PM
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Join Date: Jul 2013
Posts: 13
Default 99 s70 ac system gone crazy

Greeting fellow Volvo owners
Well it's summer once again and AC problems show up .
A/C compressor disengages during acceleration from stop and at speeds above 2000 rpm, it kinda acts like when it gets to higher rpm pressure increases turns off compressor, will not re-engage clutch automatically, will only re-engage after turning it off manually on control panel, and bellow 2000 rpm, normal cruising speed. No issue at idle, gets cold like it should . Receiver/dryer new...
450k miles on compressor, previous issue compressor or system, would disengage only on right turn only, otherwise worked great. That's what prompted the new receiver/dryer .
Any help appreciated before buying new parts...

p.s. could somebody please tell me where is the expansion valve is ! 99 s70 base, front wheel drive.
Old 07-11-2017, 08:46 AM
Psaboic's Avatar
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Join Date: Jan 2006
Location: SW, WA
Posts: 2,225

I would suggest checking the high pressure switch for proper operation, and possibly re-shim the clutch on the compressor.
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