Hi,

Looking to confirm if indeed my regulator(aka porcupine) is toast? I followed the excellent write up on getting to the blower, put in a known good blower and as suspected no joy. Old one didn't turn on the bench and had a binding feel when turned by hand i.e. didn't turn easily.

Prior to this I did some testing at the plug behind the brake booster and got PBU off: 0.06V, PBU Low: 1.22V. PBU Auto:3.98, PBU High 7.4 and Desfrost: 7.36. Checked the Blue and Red wires at the blower got 12.31V Ign Key on ACC2 and PBU off, then PBU on 11.49V at each setting. The Ohm on the blue wire was .06 on a 200Ohm scale. Finally, grounded the Blue contact on the blower to battery neg. and it ran at high.

From all the reading I've done here the regulator appears to be a goner, would you all agree? Are there other tests I should have done? Lastly, how does one get it out? I've removed the two nuts and one screw and am able to pull up the bottom of the blower housing and the regulator almost comes out, but not fully.

Treetops

sounds like a blower motor regulator....

...but first start your engine, turn on the blower... then back off ever so slightly on your ignition key... some times that's the issue

otherwise..there are write ups... you have to start by removing your windshield wiper... and start tearing down from there..... no shortcuts are known... it's located under the blower on the 124

__________________
1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


[/SIGPIC]

Thanks I the ignition test did awhile ago with the old blower, put the new used one back in a tried, no joy. Off to source a regulator which I finally got out.

Treetops

It was the regulator. Installed a used unit and blower runs as it should.