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jimscat: The following is from my original post: My '91 legacy has 175K on it. The AC has never been serviced. Over the past 3 years of operation the unit has become intermittent. Its as though it has a mind of its own. Typically, in the morning, when I go to work, the AC is reluctant to come on. Sometimes I'm a mile from the job before it decides its time to cool the car. Other times it may kick on almost immediately and remain that way or go instantly back off. When it does come on, it cools the car as it did when new. When I go out to lunch and the interior of the car is hot, the AC comes on 100% of the time and operates great all the way to my destination. When I leave my lunch stop to return to work, however, the AC becomes more iffy. It may come on immediately and work fine or have a delayed start and operate intermittently on the way back to work. Occasionally, I get into the car and drive it for 20miles and the AC works perfectly. Any suggestions? Since this post I've been fiddling with AC relays under hood. Purchased new after market relay (so big that I had to weasel in with screwdriver) and swapped out with those under hood. Didn't seem to make any difference. Although, AC may now be more intermittent since I've started messing around.

Anyone out there have an AC schematic for a '90 - 94 legacy (I assume they're the same). Something showing the mechanical as well as electrical componentry would be nice. Looks like will have to try and troubleshoot intermittent electrical problem on my own. Not knowing anything about AC, should prove a challenge.

My '91 legacy has 175K on it. The AC has never been serviced. Over the past 3 years of operation the unit has become intermittent. Its as though it has a mind of its own. Typically, in the morning, when I go to work, the AC is reluctant to come on. Sometimes I'm a mile from the job before it decides its time to cool the car. Other times it may kick on almost immediately and remain that way or go instantly back off. When it does come on, it cools the car as it did when new. When I go out to lunch and the interior of the car is hot, the AC comes on 100% of the time and operates great all the way to my destination. When I leave my lunch stop to return to work, however, the AC becomes more iffy. It may come on immediately and work fine or have a delayed start and operate intermittently on the way back to work. Occasionally, I get into the car and drive it for 20miles and the AC works perfectly. Any suggestions?

My '91 legacy has 175K on it. The AC has never been serviced. Over the past 3 years of operation the unit has become intermittent. Its as though it has a mind of its own. In the morning, when I go to work, the AC is reluctant to come on. Sometimes I'm a mile from the job, and it decides its time to cool the car. Other times it may kick on almost immediately and remain that way or go instantly back off. When it does come on, it cools the car as it did when new. When I go out to lunch and the interior of the car is hot, the AC comes on 100% of the time and operates great all the way to my destination. When I leave my lunch stop to return to work, however, the AC becomes more iffy. It may come on immediately and work fine or have a delayed start and operate intermittently on the way back to work. Occasionally, I get into the car and drive it for 20miles and the AC works perfectly. Any suggestions?