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Old 12-09-2009, 08:30 AM
4thesporty 4thesporty is offline
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Join Date: Sep 2009
Location: Burleson, TX
Posts: 426
Quote:
Originally Posted by MattBelliveau View Post
Try unplugging your monovalve and see if things heat up. It's located under the hood on the passenger side firewall.

X2, I had this problem with my SD blowing AC from one side, and heat from the other side. A quick check of the monovalve revealed a tear in the rubber. After a new one I was good as gold. YMMV
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1985 300SD 322,000
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