[69DAM]

Hello all,
I've been a member for a while, and haven't posted much....but i really need some help....I've done hours of searching the threads, and as a result, this is where i'm at.

1995 E320 sedan, 309k miles!! the blower is not working. what I've done:

1. checked all fuses, including strip fuse (which had a crack in it, but i bypassed with in-line 30amp)
2. took out/disassembled the CCU, didn't see any signs of arcing, etc. i actually plugged the board back in while apart, and touching my fingers on some points of the board made the aux fans come on, but that's it.
3. removed the 3-prong plug behind the brake booster and tested with volt meter. looking at the male part, affixed to the firewall i found the following:
a-left, closest to pass side-nada 0v
b-center-13-14v
c-right-9v, switched fan to low, got 1.2v

4. removed the blower motor, and bench tested with 12v. worked perfect.

so, guys, am i looking at a resistor, that goes under the blower motor? have i missed anything?

i'm halfway confident that the ccu might be ok, when i choose floor, defrost, etc i can hear all of the vac valves manipulating....

looking forward to your suggestions!! thanks in advance!!

 

[jimmyhsiung]

3. removed the 3-prong plug behind the brake booster and tested with volt meter. looking at the male part, affixed to the firewall i found the following:

a-left, closest to pass side-nada 0v
b-center-13-14v
c-right-9v, switched fan to low, got 1.2v


This connector cable goes to the blower regulator.

A fixed min speed is approx. 1.0 V (with 5 AMPS draw), while an automatic speed is approx. 1.4 to 4.7 V (with 7.5 to 22 AMPS) and the max speed is above 6 V (with 28 AMPS).

It seems that your regulator is toasted, given with your good bench test on the blower.

 

[69DAM]

is the regulator the same as the resistor? under the blower motor?

 

[jimmyhsiung]

yes...a resistor regulating the AMP input into the blower.

Check the facotry manual at 83-600. at
Model 124 Maintenance Manual Index

 

[spit64]

check the fuse connector at the fuse the plastic around get melted and fuse get poor connection the bottom part gets to low for the fuse to connect.