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Old 06-30-2001, 05:04 PM
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I pulled the front interior light out on my 87 300e w124 to change the lamp and found a strange hose attached to the left and side of it which exits out the vents on the facia next to the sliding light switch, i thought the vents were for some optional buzzer of some description. can anyone say what this hose and vent do, it`s too big for vaccum, at a guess i`d say it`s a blower to demist the interior mirror but no air seems to come out of it.

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Old 06-30-2001, 05:26 PM
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I am guessing....

...that's the hose that goes to the A/C aspirator fan. It draws in interior air to determine interior temp and set the automatic A/C.

[Edited by BENZ-LGB on 06-30-2001 at 05:39 PM]
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Old 06-30-2001, 05:32 PM
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Temperature sensor!

Hi there,
I think you have stumbled across the temperature sensor inlet port. The hose goes (via an internally mounted temperature sensor) back to the suction side of the heater motor. A small volume of air is thus drawn by the temperature sensor from the cabin of the vehicle, allowing the climate control computer to make intelligent decisions regarding heating and air conditioning controls.
Richard Wooldridge
'82 300D/4.3L V6
'74 280C
'77 Jag XJ6 (Has the same temperature sensor setup)
'77 280Z

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