Got in my 1990 300CE yesterday and was driving around town with A/C on. Stopped and started several times with A/C on and then the last time went to turn on the A/C and no blower motor...does not seem to respond at any level with any of the fan speeds on low, high, or auto functions.

No A/C or E/C or function of any of the climate controls. Fuses are good, removed and reinstalled.

Could this be a blower regulator or blower itself...how would I test this scenario?

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Norm K.
'97 E420 Sport
'06 E350 Sedan
'67 Mustang Coupe
'70 F-250
'15 VW Jetta

Check the blower motor strip fuse located in a plastic coffin like box off the left front shock tower. It may be bad even though it looks intact.

If strip fuse is OK there could be a number of other causes such as you mentioned or even a bad climate control panel.

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1989 300E

2005 Acura TL

2011 Hyundai Elantra Limited

Swing hard! Take chances!

after you start the car...try backing off the key a millimeter.... strip fuse second... if that doesn't work.... probably the regulator... about a 45 minute fix

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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]

Would you change the blower motor at the same time as the regulator?

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Norm K.
'97 E420 Sport
'06 E350 Sedan
'67 Mustang Coupe
'70 F-250
'15 VW Jetta

I think its a good idea. A blower motor is only $90 or so. transfer the squirrel cages to the new one.. be sure to blow out the box and whatever you can on the evaporator.

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Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k

if you pull the blower motor...hook it up to jumper cables and the battery... and hold on.. if it spins like it will jump out of your hands...it's ok... i have owned a lot of 124s... and it's always the regulator... i keep a spare one in my parts bin......

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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]

It's possible. The pbus will wear out. You can swap out a known good unit, or isolate the individual components to rule out their function as a cause.

TO THE PULLAPART!

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg