There is a low temp switch in the rear pillar with the A/C wiring. It keeps the A/C compressor from running whenever the temp is down around freezing or below. I speculate it is there to prevent freon leaks. When the weather is very cold, the seals and o-rings in the freon system may shrink and allow leaks if the compressor runs and the freon pressure rises. Mark John Connolly wrote: > > I believe there's a high and low pressure switch (separate switches) behind > the rear left panel > (next to the High pressure port), on my 87. > > this also jibes with my experience (failure) of my system. I had mixed 134 > and 12, and this clogged the expansion valve. In my 87', once you turned the > AC on, the pressure backed up on the high side, and triggerred the high > speed fan. If you shut the van off, the fan would run until the battery died > (8-10 hours). This is obviously not a high temp switch, if it was temp, it > would shut off again when the temp dropped. When I replaced the expansion > valve, flushed the system, and re-charged, everything operates normally > (including the high speed fan switch). > > Maybe there is a high temp switch also? > > John |
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