ok, Yak was good enough to PM me and let me know there probably isn't a compressor relay. As I did some searching of old posts, I read where somebody had thought their compressor was shot, but said that he changed out the compressor relay (I thought), and found out that his compressor was fine and everything was working great. I don't know what I'm looking for, but my ac was sporadically working after I had it flushed and recharged, before I put in the new auto hvac control unit. I had already ordered a new one from auto haus, and I put it in anyway. I'm getting tired of baking in the Missouri heat when I drive this car. Anybody ever heard of a compressor relay? (Or something that controls it that would stop it from working?) It's an 81 300D. Thanks, everybody. Ignorance can be very time consuming.

__________________
"Knowing is not enough, we must apply.
Willing is not enough, we must do." Goethe

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1951 Chevy 3100

2003 Indian Chief Roadmaster

1983 GMC 1 ton Dually

1982 Chevy 1 ton Dually, service body (sold)

'90 GMC Suburban 6.2 "SS Veg-Burban"
(single tank WVO\diesel conversion) SOLD

'81 300D ~ Mama's car...my job (now my car)(but still my job) SOLD

'83 300sd ~ rescue car SOLD

2005 Ford Taurus (Mama's new car)(NOT my job!)