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  #1  
Old 11-13-2007, 01:59 PM
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No defrost in my 300DT

Now that it is starting to look like Winter here in MN, I needed to get heat onto the windshield. I found out that my defrost does not work. When I push the button nothing happens. I also discover that there I cannot get heat to the floor. The A/C in this car has not worked since I have owned it.

Vacuum or CCU? What should I be checking?

Sorry, It is a 1985 300DT

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  #2  
Old 11-13-2007, 02:39 PM
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Most likely the CCU, try a search as there have been numerous threads on removal and repair
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  #3  
Old 11-13-2007, 02:57 PM
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A word of caution: Before replacing your CCU, make sure you aux water pump is not shorted. This *may* be the reason yours is dead, and could kill your new/repaired one.
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Old 11-13-2007, 03:00 PM
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Are the fans working?
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  #5  
Old 11-13-2007, 03:51 PM
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The fans are working

The fan is working in all settings but the defrost setting. When I push the defrost button the system acts like it is turned off.
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  #6  
Old 11-13-2007, 09:42 PM
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Quote:
Originally Posted by karl2274 View Post
The fan is working in all settings but the defrost setting. When I push the defrost button the system acts like it is turned off.
Sounds like a bad CCU solder joint.

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