Heater blower, Heater blower |
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Heater blower, Heater blower |
simonjb |
Jun 20 2018, 07:25 PM
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#1
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KiwiMan Group: Members Posts: 563 Joined: 18-October 16 From: Stamford, Connecticut Member No.: 20,505 Region Association: North East States |
I’m having a bit of an issue with getting the heater blower to work...
The motor bench tests fine The wire on the heater control lever is connected correctly When I pull the lever back, I can hear the relay clicking in the engine bay However, when I connect the fan to the heater wire the motor does not run. I confirmed that brown connected to brown and green to yellow, just like the picture below. I was holding the motor - so it wasn’t separately grounded - would that be the issue? Any ideas ? |
Tbrown4x4 |
Jun 21 2018, 05:01 PM
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#2
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Senior Member Group: Members Posts: 704 Joined: 13-May 14 From: Port Orchard, WA Member No.: 17,338 Region Association: None |
He said the fan "bench tests fine". I ASS-U-ME he means fan on bench with power and ground applied=fan works.
Brown to fan is ground (from the ground point above the relay board, I believe). Make sure there is a GOOD ground. Green to fan comes from the heater fan relay. It should have battery voltage with the fan relay closed. The control side of the relay (the coil) is grounded by the fan lever switch. I believe this is good because the relay is heard clicking. The 25A fuse on the relay board supplies battery voltage to the relay (input, if you will), and when the relay contacts close, the green wire is energized. If you hear the relay click, and you do not have power at the green wire on the fan, the fuse is bad, the relay board is bad, OR the relay is bad. Do you have battery power at the green wire to the fan? And does the fan have a good ground? BTW, a voltmeter is better than a test light. An old test light can operate on as little as 3V, so the circuit could look OK, but not be able to run whatever load is on it. |
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