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Climate control craziness!

933 Views 5 Replies 4 Participants Last post by  Opus
Hello all, my '89 420 SEL is giving me climate fits!

In summer, AC works, but system switches from AC to heat and back to AC.
AC comes back on just before heat becomes uncomfortable.

In colder weather, heat comes on but AC cycles on and off as well.
Noticed that even when heat is on the vent that blows into the back seat blows cool air.

Exchanged climate control unit with no improvement.

Any ideas? I'm at a loss on this one....

Thanks in advance.
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107 123 126 Chassis Monovalve Heater Repair Kit with Instructions |
Don't know if this is the exact one for your ride but......
I just changed mine in less then a half hour and I now have a warm cabin again!

Now for the attack on the PODS:eek:
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