When I put the fan on low, there is a chirpping sound that is driving us crazy! Any ideas on how to stop this chirpping?

Also, any suggestions on a fix it manuel for a 1990 300E?

Thanks for your help!!
Cliff

My bird in my dash only chirps when I make a LEFT Turn! I wonder how it knows.

Guys, the bird chirping is the bearings in the blower motor. They are in need of some oil, and on the W124 cars I am not sure how you get to the blower motor. On the W123 it is relatively easy, but in either case if you do a search you will likely find some data. Jim

__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)

That is what I figured. I just cannot figure out the "left turn only" aspect. Slow, fast, it does not matter, it chirps quietly. No other time.

On my 81 300SD the blower only chirps when you hit the brakes real hard. At first I thought it was brake pads, but it is the blower

__________________
1971 R600 Mack toterhome (SuperDawg)
99 NU-WA Snowbird 34+2 SE 102 5er
If it's not diesel, it's not in my stable!
53 F100 617.951/auto
95 Dodge 3500 Cummins/5 speed service truck

Mine also chirps when on low speed, and my foot is on the brake. What would cause this?

__________________
'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E

I don't have the chirp but interestingly enough I have what sounds like a mouse occasionally and only when I have a passenger. It kind of sounds like a whistly kind of peep but why would I only hear it when I have a passenger? My passengers hears it as well so I know I'm not hearing things.

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DJ


84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012

Guys,

The chirping is an event that becomes apparent when the bearing sees loads on a particular set of surfaces that may not be the normally loaded surfaces. When the fan is spinning it has rotational inertia that resists direction and attitude changes much like a gyro. When the car changes direction the fan's rotational inertia tries to resist it by providing an opposing load through the bearings to the fan housing and then the car, which temporarily loads the bearings on the surfaces that make the squeals. Same with applying the brakes, it changes the load points on the bearings enough that you get a noisy response.

Now that passenger in the seat may have to fess up about what they ate or something, but if it was me making the noise and you blamed the fan, well, why would I argue?

Hope this helps, Jim

__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)

Excellent explaination, Jim, thank you.

I'm heading for the archives

Mike

__________________
'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E