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#1
07-09-2016, 03:46 PM
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Weird random A/C Blower venting to window defrost
On this 1998 C230 I'm experiencing some weirdness with the air conditioning venting. Randomly, when the AC is running the system will switch from blowing the cold air straight out from the front (main) blower vents redirecting the cold air to blow through the window defroster vent. Then after several minutes it will be redirected back to the main frontal vents.
I don't know why the vehicle thinks the wind shield need the cold air blowing on it when I could really use it blowing on me when it's 98 degrees outside. Do you think the vehicle cares more about the comfort of the window glass than me? Any suggestions on what the problem is other than the car doesn't like me? 
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#2
07-19-2016, 04:34 PM
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Does it do this right after acceleration ?
__________________
It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein 09 Jetta TDI 1985 300D
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#3
07-19-2016, 08:10 PM
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Airflow to the windshield is the default setting. If it loses the electronic control or its vacuum supply you will get air to the windshield only. Lots of possible failure points but electronic failures are not as common as vacuum leaks in the system.
__________________
 90 300TE 4-M Turbo 103, T3/T04E 50 trim T04B cover .60 AR Stage 3 turbine .63 AR A2W I/C, 40 LB/HR MS2E, 60-2 Direct Coil Control 3" Exh, AEM W/B O2 Underdrive Alt. and P/S Pulleys, Vented Rear Discs, .034 Booster. 3.07 diffs 1st Gear Start 90 300CE 104.980 Milled & ported head, 10.3:1 compression 197° intake cam w/20° advancer Tuned CIS ECU 4° ignition advance PCS TCM2000, built 722.6 600W networked suction fan Sportline sway bars V8 rear subframe, Quaife ATB 3.06 diff
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#4
07-19-2016, 10:50 PM
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That is why I was asking about acceleration... Could be a vacuum pod (am sure they still used those damned things in a '98).
But, it won't hurt to look in the engine compartment for loose/cracked vacuum lines.
__________________
It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein 09 Jetta TDI 1985 300D
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