[W126 Coupe] A/C system / heat

[ken spaulding]

I had a similar condition after changing my mono valve.bought a new one off
of Ebay last January and installed it with no problems...
When I went for a test drive, while the A/C was working, the heater started
to come on and I couldn't shut it off.  (cut to the chase) I replaced the
"new" mono valve with yet another new part made by Bosch and everything
works as designed.

Hope this helps,  Ken
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