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The Mystery Continues...1996 Volvo 850: ECC (Electronic Climate Control)

posted by  onlyVolvo on  Tue Mar 4 02:16 CST 2014
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last visit: Thu Jun 26 20:57 CST 2014
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First, thanks to all who have offered their diagnostic advice... I have narrowed down the problem, I believe, to either the heater blower motor or the heater fan motor resistor. I obtained a used heater fan and motor out of a wrecking yard and tested the fan motor by applying 12VDC. It worked fine. I also obtained the compnanion heater fan motor resistor for our automated ECC (Environmental Control Module). The automated version has a resistor that has an aluminum-finned heat sink while the manual ECC version is ceramic. I have the former. My one remaining question is how can one test the resistor outside of the vehicle to ensure that it is good? I tried to measure the ohmic resistance with a simple DVM but got no reading. Is this a conventional resistor or is it a MOSFET chip or some other type of device?

Any guidance will be greatly appreciated as I will attempt to fix our malfunctioning heater blower shortly.

Many thanks,

OnlyVolvo








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    The Mystery Continues...1996 Volvo 850: ECC (Electronic Climate Control)

    posted by  KlausC on  Tue Mar 4 11:08 CST 2014
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    last visit: Fri Oct 24 10:15 CST 2014
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    it is actually a MOSFET transistor. The easiest way to test is to unplug the one in your car and plug the 'new' one in.

    I searched without luck for a specific thread where someone had replaced a large resistor inside the housing, getting the part from radio shack. Most of the time, the wiring melts due to the heat.

    BTW, ECC for electronic climate control and MCC for manual climate control.






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