interior fan stops when I start the engine,

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Feb 18, 2016 | 04:54 AM

Boo Teddy

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interior fan stops when I start the engine,

when the ignition is on, everything works as it should, but when motor starts .... interior fan stops working ... it can be a sensor?
it is a Corvette C4 1986 mod.

Feb 18, 2016 | 07:26 AM

antfarmer2

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How are the fuses?

Feb 18, 2016 | 07:29 AM

Boo Teddy

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can it be fuses when fan works until the engine starts?
there own fuse when motor runs?

Last edited by Boo Teddy; Feb 18, 2016 at 07:30 AM.

Feb 18, 2016 | 07:47 AM

antfarmer2

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It seem to run on a differant circuit once started. I would check all fuses and the fuseable links and power block behind the battery.

Feb 18, 2016 | 08:09 AM

WVZR-1

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Quote:

Originally Posted by Boo Teddy

when the ignition is on, everything works as it should, but when motor starts .... interior fan stops working ... it can be a sensor?
it is a Corvette C4 1986 mod.

If your '86 has C68 AUTO AC I believe the blower actually runs for a brief period when "keyed on or run". I believe it's dependent upon inside/outside temps sensed by the system.

If the car has manual AC C60 I don't believe it's possible.

Feb 18, 2016 | 10:28 AM

RWDsmoke

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From: San Antonio Tx

Blower motor power is from fuseable link K by the starter.

Feb 18, 2016 | 11:14 AM

Boo Teddy

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after fan has stopped, when I start the engine, the key being out for about 15 minutes before I get fan to start again .. could it be? blower control module ? can i test the module? ohm ??

Feb 18, 2016 | 11:29 AM

antfarmer2

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It does sound like a module or a relay could be heating up. Maybe try tapping them to see.

Last edited by antfarmer2; Feb 18, 2016 at 11:30 AM.

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Feb 19, 2016 | 01:07 AM

Cliff Harris

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From: Anaheim CA

Quote:

Originally Posted by Boo Teddy

after fan has stopped, when I start the engine, the key being out for about 15 minutes before I get fan to start again .. could it be? blower control module ? can i test the module? ohm ??

The blower control module is all electronic so it can't be tested with simple tests.

The BCM is controlled by the HVAC controller so there are more electronics there. Again, no simple tests possible.

You're pretty much limited to wiggling wires...

Last edited by Cliff Harris; Feb 19, 2016 at 01:08 AM.

Feb 19, 2016 | 02:20 AM

#10

Boo Teddy

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I've measured that it is about 10V of HVAC in bruun line at BMC in 4 wire connector, so it should be ok HVAC. has ordered a new BMC so I hope it will be good.

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