Interior fan replaced problem - PeachParts Mercedes-Benz Forum

Guyton Buzz · #1 09-27-2013, 03:18 PM

AC fan always ran very strong in this car, which I have had for about a year. Started squeaking, I knew the end was near for the blower motor. It died on a 95 degree day on way back from Augusta. I had a spare on the shelf. When I swapped it out (wiper motor removed, etc.) I found that:

1. Unit in car had been replaced before, junk yard crayon marks on it, and scratches all around the metal clips that hold together the plastic housing that surrounds the fan.

2. The two rear metal clips had not been latched down by previous work. So the big fresh air damper plate that swings just above the fan housing could never close more than about 50% without catching on the clips.

3. With clips in correct position, used fan I installed is working, seems cooler, and quieter. Not as much air flow. Made sure to oil the fan bearings before install. Now to get the next spare from the boneyard. New ones are pricey, and I'm not sure how well I could swap a motor with those tender plastic blower wheels.

jimandsuzy · #2 09-27-2013, 06:46 PM

Quote:

Originally Posted by Guyton Buzz

AC fan always ran very strong in this car, which I have had for about a year. Started squeaking, I knew the end was near for the blower motor. It died on a 95 degree day on way back from Augusta. I had a spare on the shelf. When I swapped it out (wiper motor removed, etc.) I found that:

1. Unit in car had been replaced before, junk yard crayon marks on it, and scratches all around the metal clips that hold together the plastic housing that surrounds the fan.

2. The two rear metal clips had not been latched down by previous work. So the big fresh air damper plate that swings just above the fan housing could never close more than about 50% without catching on the clips.

3. With clips in correct position, used fan I installed is working, seems cooler, and quieter. Not as much air flow. Made sure to oil the fan bearings before install. Now to get the next spare from the boneyard. New ones are pricey, and I'm not sure how well I could swap a motor with those tender plastic blower wheels.

You could buy a china made one that comes with new wheels. Don't know how long they will last but they are cheap to buy. You didn't say what model, mine is 450sl and the fan is easy to replace from under the hood.

emerydc8 · #3 09-29-2013, 05:36 AM

I went that route with the Uro Chinese fan motor. I ended up sending it back after only a day. The Uro vibrated and was so loud on high that I couldn't even hear the engine running.

I ordered a Bosch from Peach Parts without the cage for about $100. I think the original is a Behr. If you carefully use a heat gun to warm up the existing fan cage, you can slide it off the motor shaft and install it on the new motor. Be careful not to melt the cage and make sure you pay attention to the placement of the cage on each motor shaft or you'll have to readjust to fit in the casing.