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#1
04-27-2008, 12:52 AM
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Help, 190E 1990 2.6 blowing hot air from side and top vents
The heater in my car is constantly blowing out hot air from the side and top vents even when i turn on the a/c. the a/c is cool, but the side vents continue to blow out hot air. any suggestions?
thanks for taking your time to help out. 
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#2
04-28-2008, 07:48 PM
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its a 190E 1990 2.6. just had the a/c fixed a few weeks ago, its just the heater is stuck on and wont turn off
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#3
04-28-2008, 10:24 PM
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See if your monovalve is disconnected, or if you have a blown fuse (inspect fuses very closely!!).
__________________
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 Last edited by whunter; 05-01-2008 at 01:44 PM.
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#4
04-29-2008, 01:01 AM
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i was going to say monovalve...do a search, this has been written about
__________________
1994 C280 2009 VW Tiguan 1993 Toyota X-tra Cab SE-5 1973 220D  ... Gone, but not forgotten1991 Alfa Romeo 164L  Gone, wife MADE me forget it2006 Hyundai Tucson... just straight out FORGOTTEN! 
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#5
04-29-2008, 07:19 PM
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Easy way to check monovalve......
.... with the car up to temp and running, do a check of the heater hose temp.
Feel the return hose(on pax side) and if it's hot, the monovalve is passing coolant. Why? Either it's not getting closure power, or the rubber is torn. Do a search. As has been said, much is written.... Jim
__________________
14 E250 BlueTEC black. 45k miles 95 E320 Cabriolet Emerald green 66k miles 94 E320 Cabriolet Emerald green 152k miles 85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles
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#6
05-01-2008, 01:49 PM
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Vacuum controlled heater valve
Look for broken or disconnected vacuum lines.
PART NUMBER SEARCH RESULTS WITH PRICES Vehicle 1990 Mercedes Benz 190E 2.6 Part: Heater Valve Note: Vacuum controlled. R3020-11893 Heater Valve Germany IN STOCK Have a great day.
__________________
ASE Master Mechanic https://whunter.carrd.co/ Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 2003 Volvo V70 https://www.boldegoist.com/
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