The SD has no functioning blower.

It has power on fuse #11 but there is no power at the blower. The blower runs fine when 12V is applied directly.

Anyone know where the blower controller is on the SD?

Anything else to check?

blower regulator controller up behind the passenger lower dash, the black box.

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

John, there is a black box attached to the back of the kick panel. It appears to be related to the sound system at some point in the past since it has a type of coax connector.

I presume the regulator must be attached directly to the firewall in some fashion. What size would it be???

For some reason I believe the pre 86s to have a similar relay to the Klima of the '86+. I could have sworn I've seen it down there... unless it's in the fuse box

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

Brian, did you check the cold engine lockout? It's next to the EGR temp switch. The wire to that switch needs to see ground or the blower won't work.

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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.

I definitely need to do that, Pete.

Can you confirm that the blower won't work on both HI and LO, in addition to AUTO? Hattie mentioned that the blower will function on HI and LO, independent of the temp switch, but I can't remember if this was true on the SD.

Thanks for the heads up. Especially since that switch was involved in the removal of the head.

Brian, did you get this figured out, i am having a near identical problem. what did you find out?

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rodney

I confirmed that there was continuity to and from the resistors. Since two different blower controllers failed to function, I took a chance with a replacement CCU.

Turns out that I was correct, fortunately.

i wasnt so lucky, i've replaced the ccu, the motor, and the ignition, still have the same problem, onward i go

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rodney