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> Heater Control Valve
jaturner76
post Nov 16 2009, 09:25 AM
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I have expereinced the common heater control valve failure. I removed the metal arm and pushed it into the open position and now have heat again. Everything seems to work fine, heat, ac, etc. So why bother replacing it? I know it the AC would operate more efficiently if it were able to close. But is that it? Do I risk damaging anything if I just leave it in the open position? Thanks in advance.
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KiT TeUnG 2549
post Nov 16 2009, 10:26 AM
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Heater Control Valve? Yu mean the blend/mode control actuator on the evaporator and heater case inside the car? There isnt a heater control valve on this car.
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jaturner76
post Nov 16 2009, 10:34 AM
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Maybe the Heater Control Motor? MR958603 . Under the passenger side glovebox/radio area. Lets water into the heater core is my understanding for heat, closes to prevent water in to make AC more efficient.
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SRSONE
post Nov 16 2009, 12:20 PM
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u wont hurt anything
but the a/c probably wont work very well with the hot water going thru the core all the time..so if u want wear out your a/c faster go ahead..
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KiT TeUnG 2549
post Nov 16 2009, 02:03 PM
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It doesnt let water in. Water is always flowing to the heatercore. Its a wut yu are speaking of controls the blend mode control door. When the A/C is on it closes off the section where the heatercore is. When yu have the heat on all the way it closes the lower passage and diverts air onlee thru the heater core for heat. it changes position as yu change the temp settings
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jaturner76
post Nov 17 2009, 08:10 AM
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If it was the blend door, wouldn't I only be able to get heat or only get AC? Right now, it is disconnected. I can change the heat settings all the way from AC, cool air, warm air, to hot air. While disconnected (in the open position) it doesn't appear to be impacting anything. When i force it to close I lose heat. With everything "appearing" to work as normal, my concern is what the long term impact if any of not replacing it and just leaving it forced open would be. Thanks
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KiT TeUnG 2549
post Nov 17 2009, 10:13 AM
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There is a level door (def , panel/face/ floor etc) and the mode control blend , and the air recirculation damper door. With the recirculation damper door fully open or closed will impact how hot the heat will be on heater if yur in cold weather. I think yu are mixing the recirculation damper actuator for wut yu think is the mode control blend actuator
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jaturner76
post Nov 17 2009, 01:36 PM
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Thanks for all of the replies. I am 100% sure the part number is MR958603. Do I need to replace it and what will happen if I just leave it stuck open?

Thanks again.
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KiT TeUnG 2549
post Nov 17 2009, 09:35 PM
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Not doubting the part number. I understand it may be called one way for yur catalogs wut not , but here it catalogs as a nother part with also an MB part number and MR part number. Altho despite wut it may be called for yu , it actually controls sumthing else that helps contribute to aid for the heat control. Its not a heater control valve It actually helps to control inside air flow for best heat , basically closing off the fresh air duct. As for its situated on the blower casing and not the heater and evaporater case.
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