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#1
06-01-2009, 02:38 AM
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'91 300E constantly blowing warm air, not sure why...
First symptom was blowing warm air at any setting, second was continually blowing #7 fuses. I replaced the CCU with one from an '87 and the blower seems to work properly and the fuse doesn't blow anymore. I checked the 134a port with a autoparts can equipped with a gauge and doesn't indicate low but it says to "take it to a specialist." Before I do that I'd like to eliminate some possible faults.
Voltages: key to Acc: 0V key to far right: 12V Engine running, no fan: 3V Engine running, fan on: 13.65V Engine running and wheel turned to max hot, fan low & high: 13.4V Engine running and wheel turned to max cold: 4V +/- .20V Engine running button to defrost: 4.2V I can feel constant warm hoses to and from the heater core. I applied 12V to the heater valve and aux pump and both appear to operate (click at valve and motor running at pump). Both get power when the ignition was switched. An earlier symptom was clicking under the dash. I believe vac pod(s) are blown but haven't checked them with a vac pump yet.
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'88 300TE, 175k, black RENNTech 3.6L Recaro C's AMG 1 SOLD '92 500E, 110k, Spruce green, stock SOLD '94 E320 Cabriolet, 130k, E500 wheels, Emerald green SOLD '94 E320 Cabriolet, 110k, black, stock, SOLD '88 300TE, 229k, dark grey, SOLD '90 300CE, 212k, white, new paint, SOLD '91 300E, 209k, white, rebuilt head SOLD '74 914-6, grey, 2.7L 325hp twin turbo Audi conversion 
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#2
06-01-2009, 08:04 AM
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Have you tried blocking the heater supply hose off?
Just because the heater valve clicks doesn't mean it closes off the water flow.
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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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#3
06-01-2009, 07:16 PM
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ditto.
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David S Poole European Performance Dallas, TX 4696880422 "Fortune favors the prepared mind" 1987 Mercedes Benz 420SEL 1988 Mercedes Benz 300TE (With new evaporator) 2000 Mercedes Benz C280 http://www.w108.org/gallery/albums/A...1159.thumb.jpg
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