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Re: AC shuts down on hills and acceleration[740-760/1986] posted by Philip Bradley on
Friday, 29 May 1998, at 10:08 a.m.

The AC is supposed to shut down on hills and acceleration. Basically anything over 3 or 5 psi of boost, as I recall. Perhaps yours is misadjusted or you go up a lot of long hills where you notice the cutoff or your AC is low on freon or R134a and is marginal even when it does work. --
Philip Bradley

Re: AC shuts down on hills and acceleration[740-760/1986] posted by George Swift on
Saturday, 30 May 1998, at 1:03 a.m.

If my A/C shut down climbing hills, during acceleration, or under high boost, I'd never have A/C ! I have never heard of that, and I don't believe it. I think some mechanic blew some hot air up somebody's skirt because he couldnt find the vacuum leak. I know this is a Ford trick, but I don't think volvo works like that. At least all the one's I work on don't. Straighten me out somebody. --
George Swift / Volvo Car Care

Re: AC shuts down on hills and acceleration[740-760/1986] posted by abe crombie on
Saturday, 30 May 1998, at 10:30 a.m.

The only volvos that have a/c shutdown on acceleration are 89 1/2-91 models with 16 valve 4 cyl., all 850/s/v/c70 and all 960/s/v90.
Any others that have that feature have been JCWhithneyed.
The 16 valve models used an a/c interrupt relay (green or blue on left strut tower) triggered for 12 seconds by full throttle contacts in throttle switch assy.
The inline 5 and 6 cylinder engines do it with programming in the engine management CM that tracks rate of throttle application and amount of throttle opening and determines an off time of between 5 and 15 seconds.


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