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  1. Sep 2, 2015 · How To: Repair the Heater Control Valve. Here is a write up on a tear down and rebuild of a heater control valve. This is the same write up as the E39 5 Series as they use the same heater control valves.

  2. Feb 27, 2021 · Yes, you can take the valve apart to inspect/repair them. I had to do this to one of my E-types when the valve started leaking, and the new one that I bought was cracked/junk. I was able to use part of the old valve, and the head/innerds from the new junk valve.

  3. Nov 11, 2017 · The heater core and heater control valve are used in both the A/C and heating modes of the IHKA system. The IHKA module, amongst other things, sends a pulsed signal to control the heater control valve, during both heating and cooling modes, to maintain the set temperature in the cabin you have set.

  4. Jun 30, 2008 · Here is what the changeover valve looks like. (old valve unit) 1st, remove the outer weather-stripping. 2nd, you’ll need to remove both wiper arm assembly with a ratchet and a 13mm socket. Here are the 3 nuts you’ll need to remove. Next remove this module on the driver’s side.

  5. Sorry for this being a long video.Initial Heater Valve Disassembly 0:00New Heater Valve Test 4:51Continue Disassembly of New Valve 6:26Reassembly 8:31Extras ...

    • 15 min
    • 5.3K
    • Dirty Sandal Garage
  6. Jul 20, 2014 · If there is less coolant flow available to the matrix because the pump is running slowly (as at tickover), or if the coolant is not yet warmed up, a given position of the knob opens the heater valve (‘‘water valve servo unit’’) more because the knob has more vacuum available, and vice versa.

  7. UPDATE - BMW Master Technician has confirmed that there is no control valve on E9Xs with Automatic Dual Climate Control - temperature is controlled by flaps which pass the air over the Heat Exchanger (i.e. matrix) or AC Evaporator - basically a hot radiator and a cold radiator.

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