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Re: Cooling fans not working?
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Posted by Kevin K [Email] (#374) [Profile/Gallery] (more from Kevin K) on Wed, 26 Jun 2002 11:22:07 Share Post by Email
In Reply to: Re: Cooling fans not working?, JimBlake [Profile/Gallery] , Wed, 26 Jun 2002 09:55:25
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"It looks like '88 & 89 AC will run both fans. The low-pressure switch at the receiver/dryer will interlock the fans as well as the compressor."

This is where I disagree ... the interlock(s) is only to the compressor relay, that triggers the rad-fan (right) only. Low pressure switch did prevent my 83T from running both fans, but ac fan did run. With can of R12 added, the low pressure switch was then satisfied by pressure, when compressor was on. I think this is true for later years too.


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from one of my prior posts:

With AC button on, AC FAN relay (155) turns on AC_FAN full time, powered by fuse #6. Normally, the compressor will cycle off, based on near freeze-up sensed in the cold coil. If this sensor is happy, the compressor relay (156) kicks compressor back on, and also provides an isolated bypass to the stuff that normally turns the RAD_FAN on.

So, AC borrows the RAD_FAN, powered by fuse #25, whenever the compressor has cycled on. If both fans run full time, the cold coil is NOT getting too cold, or there is a fault.

posted by 52.128.3...

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