L31MaxExpress
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I did some testing on the GMT400 condenser pusher fan like the one my 1999 Tahoe came with from GM. I recently added one to the 1987 G20 van. Ended up dropping the vent temps about 5°F at idle as well as reducing some of the stress on the a/c compressor. I have the relay that controls the fan tied into the high blower fan relay turn on signal from the blower motor speed control switch. When I flip the interior blower fan to high speed, it turns on the fan. Later on I will deligate control of the fan to the P59 PCM.
Here is a clip of the testing. With everything heat soaked, it took about 4-5 minutes for it to provide the lowest presaures and coolest air. That being said the pressures started dropping immediately when I activated it.
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Here is a clip of the testing. With everything heat soaked, it took about 4-5 minutes for it to provide the lowest presaures and coolest air. That being said the pressures started dropping immediately when I activated it.
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