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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 03-16-2006, 02:18 PM   #1 (permalink)
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htr not blowing hot

hi all this is my first thred so please give me some time to get it right .i have a 1990 320i touring nice but the htr gets hot on idle but when driven blows cold and i have no idea .have replaced thermostat checked fluid both ok any help gratley recieved.
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Old 03-19-2006, 10:29 PM   #2 (permalink)
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Sounds like you have a bad or clogged heater core solenoid valve, The soleniod is behind the right kick panel of the drivers foot well. At full cold setting, the solenoid gets energized and shuts off the cooland flow. When it gets partly clogged it lets slow moving coolant to pass (idle) and plugs up when fast moving coolant tries to enter (driving). Try a heavy duty coolant flush and adjust the temp dial from max cool to max heat while flushing the system.
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Old 03-25-2006, 10:25 AM   #3 (permalink)
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thanks i have a doner car and have removed the iten i think are they all the same and can i just replace this item without to much hassle
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