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#1
01-06-2003, 10:06 AM
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Tick Under Glovebox
I recently purchased an 1986 190E that seems to be in very good shape. I have noticed an intermittent tick that comes from under the glovebox area. It seems intermittent while the climate control is on, but it also clicks when I touch the brake pedal. Is this a problem relay or something that sounds normal... Quite annoying regardless. Any suggestions?
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#2
01-06-2003, 10:26 AM
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There is a vacuum switchover unit behind the glove box that may be causing it. ?
__________________
1994 E500 (MY SUNDAY DRIVER) 1993 190E SPORTLINE LE W/ M104 SWAP 1997 C230 2002 ML320 2000 BMW 528I (WIFEY'S CAR) "Excuses are crutches for the unfounded."
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#3
01-06-2003, 02:31 PM
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Would a vacuum switchover cause a tick when the brake pedal is depressed..e.g... are the brakes or lights somehow operated through it?
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#4
01-06-2003, 03:29 PM
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LOL! Finally! Someone else is asking about this! My SD has/does the same thing. I found a "black box" down under the floor mat that the ticking comes from. It's under the glove box, mounted on the forward, almost verticle part of the footwell. Starts ticking when the doors are opened, ect as you say. Ticks for 30 seconds or so, then quits. It's quite a bit louder when you have the floor mats and underlying insulation out.
Have no freakin' clue what it does. 
__________________
past MB rides: '68 220D '68 220D(another one) '67 230 '84 SD Current rides: '06 Lexus RX330 '93 Ford F-250 '96 Corvette '99 Polaris 700 RMK sled 2011 Polaris Assault '86 Yamaha TT350(good 'ol thumper)
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#5
01-06-2003, 05:57 PM
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ON the W201 chassis this ticking is a common PROBLEM. The feed-back potientiometer for the blend-air door will get a bad spot & then you will hear this ticking from the switch-over valve group. YOU need a new feed-back resistor.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#7
01-08-2003, 01:47 PM
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Ok.. so if I am getting perpetual heat from the outside vents, I can assume there is a vacuum leak and the noise is related. I'll ask again so I am clear.. this too would cause the same noise to happen when I press the brake pedal?.. I can't see the connection, but I am relatively new to this. I really appreciate the help.
Where is the feedback resistor located? 
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#8
01-08-2003, 05:51 PM
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The reason you might hear a change when the brake pedal is depressed is, the feed-back pot is mounted on the blend air flap that is VACUUM controlled. If the vacuum is reduced then the FLAP will move changing the position of the potentiometer.
BTW the feed-back potiontiometer is at the top of the heater box & the COMPLETE dash must be removed for replacement.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#9
01-08-2003, 06:35 PM
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M.B.DOC
I will shortly be replacing the heater core on my daughter's '87 190E 2.3. Your comment on replacing the potentiometer requiring the dash removal makes me want to ask what components should be done while I have it apart? -Heater core -Potentiometer -??? Haasman
__________________
'03 E320 Wagon-Sold '95 E320 Wagon-Went to Ex '93 190E 2.6-Wrecked '91 300E-Went to Ex '65 911 Coupe (#302580)
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