1997 S320 Location of HVAC Fan Blower Motor - Mercedes-Benz Forum
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#1 (permalink) Old 05-31-2011, 07:48 AM
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1997 S320 Location of HVAC Fan Blower Motor

Hello,

Does anyone know how to get to the hvac fan blower motor in a 1997 S320?

Not sure how to get to it and where it is located. Any feedback is greatly appreciated.

Thanks.

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#2 (permalink) Old 05-31-2011, 07:59 AM
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Pop the hood, and just forward of the cowl (where the wipers are) you'll see a large plastic cover that extends from the passenger side almost to the driver's side. There are several large phillips head screws holding it down. The blower motor is on the passenger side beneath the cabin filter which is under the large cover.
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#3 (permalink) Old 05-31-2011, 11:45 AM
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Are you having problems with your blower?

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#4 (permalink) Old 05-31-2011, 04:28 PM
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Hi 95Coupe,

Thanks for your feedback, that was right on target. I have access to the blower now. After this it is a matter of figuring out what is wrong. Not sure if it is the actual blower or maybe one of the other electronic parts (eg resistor or speed regulator).

As I get any updates worth sharing I will pass it along.

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#5 (permalink) Old 05-31-2011, 05:11 PM
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You might try giving the impellar a little push start when it's supposed to be running. Mine came on; I bit the bullet and bought a new motor. The regulator bolts right on to the motor; the leads connect directly to the motor, and is suspect as well.
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#6 (permalink) Old 05-31-2011, 05:26 PM
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Hi 95Coupe,

I just ran some tests and few things came up.

The blower is working confirmed after removing he cover and the filter

What was interesting is that the air coming inside the car was working slightly better, which then raised the question if the filter (or other filters) may be hampering air to flow through the blower.

I vacuumed the filter on both sides, put it all back together and started the car. The air was running better already, but unclear if at the level it should be.

1. Since I bought this car used I don't know how hard the air is suppose to blow even at a "max" setting. My perspective is that it is not blowing as hard has it could. Certainly hard to ear the air blowing. Any thoughts on this?

2. Not sure how to test if the regulator is hindering the blower from turning faster, which would be related to the above question?

3. Any other filters that I should now about that may be hindering air flow?

Thanks for any thoughts on the above.

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#7 (permalink) Old 05-31-2011, 08:32 PM
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To complete your visual fan inspection, it shouildn't stop to abruptly when de-energized. At high speed, they move an impressive amount of air. Could be vacuum damper problems, but don't forget to check the filter above the passenger footwell.
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#8 (permalink) Old 05-31-2011, 10:00 PM
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Does it stay running at low speed even when you turn it up to max? Max should deliver very high flow. That is blower regulator failure. Very common.

Just replace the filter. It's cheap.

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#9 (permalink) Old 06-01-2011, 08:25 AM
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I don't have my CD service manual at work, but there might be a procedure for checking motor RPM per voltage input. Quite right that it might be the controller. I can check tonight. +1 on the air output being very good when everything is correct.
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#10 (permalink) Old 06-02-2011, 12:38 PM
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I had to change my blower regulator on both my parents' car and mine. It's veeeery common apparently.

If you had the fan set to max, you wouldn't want to be anywhere near the fan because it blows so hard. Imagine sitting in-front of a real fan.
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