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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E46 (1999 - 2006)

E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 04-17-2016, 08:48 AM
PancakeBimmer PancakeBimmer is offline
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Mein Auto: 02 BMW 325i
Does IHKA Water Control Valve run hot or cold?

Maybe someone can enlighten me if IHKA Water Control Valve supposed to be warm/hot to touch when operating or plain cold. Whenever I worked on my car it would always get warm/hot with cold engine and ignition turned on. Recently I have been getting a **** ton of cooling problems and after new pump, thermostat, and multiple bleeds I am just out of ideas. This water control valve is my last suspect that might be malfunctioning, trapping air in the system and occasionally releasing it into open loop. So is this valve supposed to be warm or cold when operating normally? Ignition has been on for 15 minutes and this valve is still cold, whereas before it would be pretty warm now.
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Old 04-18-2016, 04:09 AM
marcozandrini marcozandrini is offline
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Mein Auto:
The valve is normally open. That is, unless it's receiving 12VDC the valve is open. Why? This design prevents coolant from stagnating in the heater "radiator" in the dash. Think south Florida. If someone never used the heat the coolant would never flow through the heater radiator.

The valve should be hot (ok, at least warm) regardless what's happening, except the ignition being off. That is, if you're using the AC the valve will be warm as the climate control is sending 12VDC to the valve to keep it closed. When you're using the heat the valve will be warm (then hot) as coolant is flowing through it. I bet you have an air pocket in the heater hoses.
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