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Old 06-13-2015, 07:50 PM   #1
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Hi Speed Relay Location

Having trouble locating the hi-speed blower relay. The motor started acting up and making noise but I ignored it... then it blew something and only works on one low speed. Replaced the motor since the other one was shot and now can't find a fuse or relay that operates the other speeds. I think it may also be the resistor but don't know what it looks like or where to find it on the coach. Have looked under the hood, under the dash and can't find it. Have a 2003 Allegro Bus on a Freightliner chassis. Any help would be greatly appreciated. :
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Old 06-13-2015, 09:35 PM   #2
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During the work replacing the blower motor did you happen across a system name for the whole system ; Evans and Denso are the most common.
Resistor block is usually just down steam of the blower motor in the spot where it gets max air flow for cooling, mine is within inches of the squirrel cage. Picture below. Just past the fan motor with all the wires.
Have you tested the fan speed switch for output in all positions?
Fan speed default is usually high, as the power doesn't go through any resistance at the block.
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Old 06-14-2015, 03:55 AM   #3
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Old 06-14-2015, 11:27 AM   #4
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Hi Speed

The system is an ACME and it doesn't have anything that looks like your picture in that area. It's running on low and med/low but doesn't work on med/high or high. Thanks for the help.
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Old 06-15-2015, 04:36 AM   #5
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Fixed it

OK, after tracing wires forever...couple things I figured out and thought I would share:
You can find a group of relays together under the dash near the AC power controls. These three control lots of things but basically all of the power requirements for the Dash AC go through them.

The Blower Motor Resistor is mounted just above the Generator on the Firewall. You can test this pretty easily with a Multimeter by measuring the Ohms across the different posts while it's unplugged (I think the reading which controls the low speed should be around 600 ohms, the others should be a little lower (300-500 ohms).

Just above resistor on the firewall in the wiring harness is another relay that controls the AC Compressor and gets turned on when the AC is on.

In the compartment just in front of the left front wheel is a fuse panel that has some re-setable 20 Amp Breakers for the AC High and Medium High Fan controls. These also control when the compressor gets power as well. They have a small button you can push on bottom of the breaker that resets it.

So, bottom line is that I have 100% functioning dash AC now and didn't have to buy any additional parts. Hope this helps. Have attached a few pics.
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