Where's my 115's heater fan motor? - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 11-30-2006, 10:37 PM Thread Starter
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Vehicle: 1964 190D
Location: Grants Pass, Oregon, what's left of America
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Where's my 115's heater fan motor?

It's LOUD. I want to put some oil on the (don't remember what it's called) so it will be quiet and I can use the defrost and heat. Danke.
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post #2 of 7 (permalink) Old 12-01-2006, 12:29 AM
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Vehicle: 1976 300d @460k
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The heater fan motor is of a squirrel cage design. it is located in the center console about knee level. there is a plastic louver on either side of the console. you might be able to get some lubrication to the outside bearing surface of each fan. to get to the fan you must remove the console, not a simple task.

my favorite method of delivering lubrication to difficult places is to use model aircraft flexible control rod tubes called "golden rod" they are somewhat flexable but lend enougn ridigity.

if you need to get into a real tight spot i use fuel hose with stainless wire taped every few inches to sculpt it into any position you might ever need. a coat hanger would work in a pinch.

if you want exacting directions how to get to the blower itself i'll dust off the manual and write/ photograph a walkthru. i need to clean the dust and replace the early 80's aftermarket head unit anyway.

1976 300D
460K and counting
B20 less smoke, smoother idle. a nice solvent as well.
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post #3 of 7 (permalink) Old 12-05-2006, 04:02 PM
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Vehicle: w115 1975 240d
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There are two fans for our W115's. If you have air conditioning there is a squirrel cage blower in the center consol. The heater fan is way up inside and you can't get to it to save your life. The whole dash has to come out.
My heater fan doesn't work at all and after a week of frustration troubleshooting the wiring, switches and trying to gain access to the fan itself, this is what I did:

My air conditioning didn't work anyway so I cut the copper tubing at the evaporator coil, connected heater hose to it and ran the heater hose through the same holes in the firewall where the A/C lines were. I routed the heater hoses through one of the control valves that are next to the brake resevoir, and then to the return at the water pump. I also removed the A/C compressor and all the brackets and associated parts which gives me better access to the altenator belt tension bolt and other things.

Then I disconnected the damper controls and placed cardboard underneath the heater core so the A/C fan won't blow hot air out through the outside vents.

I have more heat than I know what to do with.

Grant
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post #4 of 7 (permalink) Old 12-07-2006, 06:35 PM Thread Starter
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Hey, I just remembered something. If I push the lever above the 4 red and blue levers to the left to let in fresh air, it makes the same noise. I'm assuming that incoming air is spinning the fan and causing the noise. Could the fan spin independant of the motor or are they fixed together?
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post #5 of 7 (permalink) Old 12-10-2006, 05:25 AM
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The fan is clipped to fan motor shaft so it sounds as though the clip has come off and the fan is worn in the bore.Does it blow plenty of air when you turn it on?.If you can here the motor speed up and slow down as you work the speed control but the amount of air doen't change you will need to pull it out and repair it.
So how does it come out?.
The easiest way is remove the front seats....
then carefully dismantle the console.
Remove the glove box and the instrument cluster ( don't break the temp guage capillary) .
Remove the control levers,Disconnect the eyeball vents under the dash.
look carefully on each side under the dash and you will see some 8 mm nuts.they hold the pad to the body.Remove the two upright windscreen moulds.If your screen is cracked etc now is the time to change it.and once removed you will see the dash pad front edge is sitting under the rubber.
remove the center air grille and radio speaker/grille.
Once you have removed all the nuts holding the pad in place,the dash pad is rolled rear wards.You will then see the fan motor under the rubber boot which connects to the grille.
The fan has to be disconnected from the firewall.Under the hood on the drivers side is a large plug which is the other end of the fan power lead.unplug this and tie a piece of string to it .pull it into the car .Fix the fan ,use a aircraft quality lube on the spindle bearings and it will last for another 35 years.
then put the car back together.
THIS TAKES AT LEAST A WEEK,IT'S NOT A WEEKEND JOB!!.
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post #6 of 7 (permalink) Old 12-11-2006, 01:27 AM Thread Starter
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Thank you for the detailed directions, but I think that's a bit beond my ability. (things tend to break when I take them apart). I'll most likely be selling my car when I get to Tucson next year.
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post #7 of 7 (permalink) Old 12-11-2006, 05:33 AM
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Talking

In that case wind own the windows on hot days,and wear a big coat on cold days....
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