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Originally Posted by 300holst
Your idea of a vacuum operated switch to turn off the AC under acceleration is a good one.  Years ago I saw an accessory switch for sale which did that. Since I often drive underpowered Volvos, I've thought of trying to find or make such a switch. What is needed is a vacuum operated switch mounted to a T in a vacuum line which comes off of the intake manifold. This switch would be wired in series with the AC compressor clutch or maybe use a relay. The switch would need to be adjustable to find the right vacuum level for the AC to cut out. As you point out, when you press down the accelerator, the vacuum decreases and the AC would be disconnected. . |
Look at my first post the 2 links give you what vaccum switch you need, then all you do is go to the back of the speedometer and put your T line on the Economy Gauge, it's all there within 12inches of each other, and make the EC switch with the vaccum (adjusted for where you would like it to cut in), in series for the 2 other compressor switches.
So the compressor only activates at half or no throttle or when braking, good for the ecology, good for fuel saving, and good for brake pad wear.
Simple for $20 you have it all.
Cheers George