The W124 cars have the HVAC blower motor behind the firewall under the center cowl. That is the first thing to check. Pull it, lube it, check the brushes.
http://www.peachparts.com/Wikka/W124BlowerMotor
When you set the head unit to A/C it changes the fan speed to be controlled by interior temperature. So since you had the A/C on a cooler temp than what was ambient in the cabin, the fan switched into max speed to cool it down quickly. Once the temp correlates to the thumb wheel setting, the fan speed will slow down.
Any setting other than Econo is auto fan.
Now the vent air discrepancy may just have been a momentary thing. Did you set the air recirculate switch, to help the cabin cool down? Doesn't sound like monovalve since you have cold air. Plus center vents are always cooler in my W124.
http://www.peachparts.com/Wikka/AcDiags
Quote:
Originally Posted by G Tirebiter
Thanks for the replies....why did the fan suddenly speed up to max and warm air is coming out of the side vent and cold air out of the center vents???
Brock
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