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Old 10-06-2004, 10:07 AM
99C43's Avatar
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Join Date: Oct 2004
Location: Irving, Texas
Posts: 2
Question 1999 C43 - A/C Blower Question - Issue

Hello, I'm brand new to this forum! ...lots of great information and friendly folks here...

I have a 1999 C43 AMG, and I have recently experienced a problem with the A/C blower fan. I searched here and there, but I could not find a direct "lead" to my issue.

After starting the C43 in the garage (normal ambient temp.), the A/C blower works great - all speeds work fine and it blows very cold.

Sometimes the car's left outside in the sun (inside temp is high), and when I start the car with the air "on", the fan will not turn on.

To "fix" this issue, I lean over slap the footwell "cover" below the blower fan with my hand. The fan will turn back on and work normally at all speeds. I've checked all of the connections leading into the blower regulator and blower motor, but nothing's loose or frayed.

Does this sound like a blower regulator problem or a blower motor (brush replacement) issue? This issue only occurs when the inside temperature is hot - like if left in the sun after being in a store for 30 minutes in the Texas sun.

Any advice would be appreciated!
1999 C43 AMG

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Old 10-06-2004, 10:18 AM
Gilly's Avatar
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Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
Those regulators on the 202's act up just like the 210 chassis.
I'd make the car ready by removing the cover under the passengers side dash so when it fails you can maybe try jumping B+ and B- to the motor and see if it takes off running. OH also in the failed state, try hitting "defrost" and see if that gives you full fan or not. You could also try measuring how much voltage is being provided to the blower in the failed state.
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Old 10-06-2004, 10:33 AM
99C43's Avatar
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Join Date: Oct 2004
Location: Irving, Texas
Posts: 2
Thanks Gilly - I'll test the voltage post-regulator when this problem occurs. You're an invaluable resource! Brent
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Old 10-06-2004, 01:06 PM
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Join Date: Feb 2003
Location: Ontario, Canada
Posts: 3,160
Had the very same problem & ended up replacing the blower Motor.
Did all the checks & fixes I could think of.
Sometimes it worked for days, sometimes for minutes.
Still kept the old blower.
May spend some more time on it when I'm retired.

2007 C 230 Sport.
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