85 Camry heater blower problem

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Old 23 Oct 2003, 09:30 am   #1 (permalink)
SY
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Default 85 Camry heater blower problem

The heater blower does not work at all, even in the high switch
position. But in the high position, and only in that position, there is
a constant humming sound from the heater relay. I have tested the blower
motor which is ok, and a repacement heater relay did not change the situation.
The blower resistor is probably defective, as the blower only worked in the
high posistion for some time, but now there seems to be an additional problem.

Its cold in Norway. Any suggestions ??
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Old 23 Oct 2003, 11:01 am   #2 (permalink)
mark Ransley
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Default Re: 85 Camry heater blower problem

did you check the fan switch on the dashboard

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Old 02 Nov 2003, 10:39 am   #3 (permalink)
Jason James
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Default Re: 85 Camry heater blower problem


"SY" <spirivip@yahoo.no> wrote in message
news:9afea755.0310230630.50d20aea@posting.google.c om...
> The heater blower does not work at all, even in the high switch
> position. But in the high position, and only in that position, there is
> a constant humming sound from the heater relay. I have tested the blower
> motor which is ok, and a repacement heater relay did not change the

situation.
> The blower resistor is probably defective, as the blower only worked in

the
> high posistion for some time, but now there seems to be an additional

problem.
>
> Its cold in Norway. Any suggestions ??


If you cant get it fixed in time for the cold weather, hot wire the blower
via a heavy swirch so you at least have the facility.

Have you checked the 'heater' fuse, paying attention to its socket looking
for overheating. These fuses pass heavy current and can overheat the socket
due the high current and then go resistive.

Apart from that, I'd get a w/shop manual as there are quite a few variants
in this area depending on whether the car has climate-control or simple AC.

From my circuit it appears there is a power-transistor which controls the
medium speed of the fan. A resistor is used to give low speed but is also in
circuit for medium, so you are may well be on the right track.

The actual blower speed switch does not pass the motor current, but all the
same ehould be tested with a digital-ohms meter on a low range.

Jason


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