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Old 12-01-2003, 06:53 PM
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Mike Murrell Mike Murrell is offline
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Join Date: Feb 2000
Posts: 2,359
The monovalve could help with the flaky heat. Mine would come and go. The monovalve diaphragm seemed to help. Someone posted a pictorial how-to(diesel 126) awhile back. Same deal.

Monovalve how-to at this URL:

For the blower, pop the hood - drivers side near firewall - fuse box. Open it up. Look at #5 fuse. If this blows, you loose the blower. Even if the fuse looks good, replace it or at the very least, reseat it, but beware - these ceramic fuses are WEAK. Reseating could break the fuse. I suppose the brushes in the blower motor could be worn. Try the #5 fuse first. Quick & simple if it solves your problem; however, I kinda doubt it will. Sounds like you've been loosing this on & off. Fuses usually are not an on/off affair. Thought I'd mention #5 anyway. Mine has blown twice in the 6 yrs. I've owned the car.
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC

Last edited by Mike Murrell; 12-01-2003 at 06:59 PM.
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