Hi-
I have been searching on the internet and in this forum for a solution to my issue for four hours now and I see nothing. If I have overlooked it I apologize.
I have a 2001 325i sedan. It suffers from a constant 12v holding the heater control valve (HCV) / water valve shut. I have learned to live with this, but I am sending the car away to college with my son, so i can no longer risk the constant threat of a drained battery (I pull fuse 62 if I am parking it for any amount of time).
One of the wires for the valve goes to fuse 62 (which is always at 12v). The other wire hooks to the back of the IHKA control panel. So knowing that the control panel is in charge of pulsing the HCV to bring hot water into the heater core this wiring setup makes sense.
The problem is that the wire heading to the control panel is always tied to ground. Therefore energizing the HCV at all times. And by all times I mean that the HCV is being held shut even if the key is pulled from the ignition and is sitting inside the house.
My reading through PDF files in regards to the IHKA setup I ran across something interesting today that I had not seen in the previous weeks of research I have done. The E46 has a feature called "Service Station" which operates by keeping the HCV closed for three minutes after the engine is shut off in order to keep hot fluid out of the heater core thereby stopping a surge of hot air when the vehicle is restarted.
This sounds like my issue if the feature was to fail and never realize that the 3 minutes is up.
Does anyone know if this "service station" functionality is built into the climate control panel? In other words if I replace the control panel will the service station feature be restored? Or does the service station feature depend on a bunch of other sensors/etc to operate? I have found control panels for $145 here so i want to see if the collective knows anything about this before I plunk down the money.
All of the other HCV threads never metion my main issue of the HCV being constantly energized even if the key is out of the ignition.
Thanks for any insight you have.
Eric
I have been searching on the internet and in this forum for a solution to my issue for four hours now and I see nothing. If I have overlooked it I apologize.
I have a 2001 325i sedan. It suffers from a constant 12v holding the heater control valve (HCV) / water valve shut. I have learned to live with this, but I am sending the car away to college with my son, so i can no longer risk the constant threat of a drained battery (I pull fuse 62 if I am parking it for any amount of time).
One of the wires for the valve goes to fuse 62 (which is always at 12v). The other wire hooks to the back of the IHKA control panel. So knowing that the control panel is in charge of pulsing the HCV to bring hot water into the heater core this wiring setup makes sense.
The problem is that the wire heading to the control panel is always tied to ground. Therefore energizing the HCV at all times. And by all times I mean that the HCV is being held shut even if the key is pulled from the ignition and is sitting inside the house.
My reading through PDF files in regards to the IHKA setup I ran across something interesting today that I had not seen in the previous weeks of research I have done. The E46 has a feature called "Service Station" which operates by keeping the HCV closed for three minutes after the engine is shut off in order to keep hot fluid out of the heater core thereby stopping a surge of hot air when the vehicle is restarted.
This sounds like my issue if the feature was to fail and never realize that the 3 minutes is up.
Does anyone know if this "service station" functionality is built into the climate control panel? In other words if I replace the control panel will the service station feature be restored? Or does the service station feature depend on a bunch of other sensors/etc to operate? I have found control panels for $145 here so i want to see if the collective knows anything about this before I plunk down the money.
All of the other HCV threads never metion my main issue of the HCV being constantly energized even if the key is out of the ignition.
Thanks for any insight you have.
Eric
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