Glad to hear you found the problem.

But I would check the fuse to make sure the tabs holding the fuse have not melted the fuse box and embedded themself into the plastic. This causes the fuse not to seat properly causing insufficient power to get to the climate control unit. After I gently pryed the tab from the plastic on my 81' 300TD, the climate control worked fine saving my some bucks.

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81' 300TD
Peter