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  1. #1
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    86 535i Is there a heater/AC blower relay?

    The heater and AC blowers just quit. There is power at the fuse, but the AC button doesn't light and neither motor runs.


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    Look up the wiring diagrams at e38.org/e28.


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    Re: Look up the wiring diagrams at e38.org/e28.

    Thanks same diagrams in my manual. No relays.

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    The only relay I know of is a small one which is

    mounted on the small PC board which is inside of the AC Temp control. It controls the compressor clutch.

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    Re: The only relay I know of is a small one which is

    Thanks. The way that it died it acted like a relay, but could be a broken ground.

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    My AC clutch coil shorted and fried the relay

    inside of the temp control.

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    Re: 86 535i Is there a heater/AC blower relay?

    Go out and look at the fuse for them. There is a heat meltdown problem in that fuse area. No real relays to speak of. But a wiring diagram is really no use. On these cars a person who knows what they are doing rarely has to get out a wiring diagram.

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    Re: 86 535i Is there a heater/AC blower relay?

    prolly the switch leads would be the next place to check for 12v

  9. #9
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    location?

    is this the temp control?

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    The little black box near your right knee with 6

    pins. Left side of console back of temp dial and AC switch. It has a PC card inside with a small relay which works the AC compressor clutch.

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    Re: 86 535i Is there a heater/AC blower relay?

    AGAIN I say.. Look around the fuse box right where the fuse is. If its look smelted down crack open the fuse box and look for heat damage.

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