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Old 08-23-2019, 08:42 AM   #1
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Forest River Owners Club
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Heater/AC blower under dash

Hi, I am new to the forum, please advise me if I have put this question in the wrong place.

I have a 2006 Class B Forest River Lexington E450 Chassis V10 engine.

Issue: The heater/AC blower won't run. I have tried the obvious things, such as checking fuses, having the engine running etc.

The AC compressor comes on ok, and the AC lines frost up which shows the AC itself is working.

I put the rotary fan switch in all positions heat, low speed, high speed, AC low AC high etc and the blow will not run. I can hear slight noises when I change the switch position which I think are air flow directors under the dash changing their positions from vent, to floor etc. They seem to be moving.

I have looked through on line Ford manuals trying to find the fuses, I found the relay fuse in the panel under the hood, the fuse is ok. I looked for the blower fuse under the dash and think I found the fuse, but the fuse is ok.
What a job identifying and find the fuses.

This seems to be heading toward a diagnosis of the blower fan has failed, or there is a wiring problem. I would check for power to the blower but its buried under the dash, do I have to take the dash apart to get to it?

Could be a bad selector switch but if it was I would think SOME positions would work. And the baffles/vanes wouldn't move if the switch was bad.

Are there any interlocks which won't allow the blower to run? Unless??? What?

Has anyone had this issue? Any ideas on how to fix this? Thanks so much,

Jeff
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Old 08-23-2019, 11:33 AM   #2
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Quote:
Originally Posted by jgilman16 View Post
Hi, I am new to the forum, please advise me if I have put this question in the wrong place.

I have a 2006 Class B Forest River Lexington E450 Chassis V10 engine.

Issue: The heater/AC blower won't run. I have tried the obvious things, such as checking fuses, having the engine running etc.

The AC compressor comes on ok, and the AC lines frost up which shows the AC itself is working.

I put the rotary fan switch in all positions heat, low speed, high speed, AC low AC high etc and the blow will not run. I can hear slight noises when I change the switch position which I think are air flow directors under the dash changing their positions from vent, to floor etc. They seem to be moving.

I have looked through on line Ford manuals trying to find the fuses, I found the relay fuse in the panel under the hood, the fuse is ok. I looked for the blower fuse under the dash and think I found the fuse, but the fuse is ok.
What a job identifying and find the fuses.

This seems to be heading toward a diagnosis of the blower fan has failed, or there is a wiring problem. I would check for power to the blower but its buried under the dash, do I have to take the dash apart to get to it?

Could be a bad selector switch but if it was I would think SOME positions would work. And the baffles/vanes wouldn't move if the switch was bad.

Are there any interlocks which won't allow the blower to run? Unless??? What?

Has anyone had this issue? Any ideas on how to fix this? Thanks so much,

Jeff
A Lexington isn't a Class B for a start. It's a small Class C.

Shut the engine off and try the following ....
Adjust the temperature control up to a comfortable level, just below the midway point for hot/cold, in other words, not cranked all the way to the lowest/coldest temperature setting.

Then let it sit for an hour or more to let things inside the dash thaw out.

It may be that you've frozen the fan assembly or directional air flow controls inside the dash by setting the temperature too low.

This happens on MB Sprinter based chassis as well, fwiw.

After waiting for a while for things to thaw, fire it up, and see if it blows "cool" air again.
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