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Old 06-08-2019, 06:34 PM   #1
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Heater on dash turns off every now and then

Hello all.

New to site and trying to figure my motorhome out. I have a 2016 class C on a Ford E 450 chassis.

My problem is my dash heater works and then stops for anywhere from 30 seconds to 2 minutes. Then it turns back on.

It does it randomly and it doesn't matter if I I'm on straight highway or hills or on the city streets.

When it started It was winter and still under the 36k warranty and ready to expire within two weeks. So dealer couldn't figure it out so they replaced the entire heater. Summer is starting but still cold where I'm at. Was working fine for about a thousand miles and back to the original problem.

Any body out there who can give where I can start at would greatly be appreciative.

Thank You Amy2
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Old 06-08-2019, 07:02 PM   #2
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Sorry, have to ask. Is it thermostatically controlled? Is the dial with the temps on it set higher than the ambient cab temperature, prior to it shutting down?
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Old 06-08-2019, 10:35 PM   #3
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E450 heater ac is a simple blower circuit, I doubt the dealer replaced the whole unit. 3 things, 1 blower switch (common on e450) they fail in the high or medium high position, 2 resistor lock, generally they work or dont work, most times you loose medium high, 3 blower motor, it has a tube on it to cool the motor, sometimes it can be plugged, blower runs then quits,after 3 to 5 min blower starts again. I have replaced a lot of blower motors in e350 e450's
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Old 06-09-2019, 09:18 PM   #4
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No it is not.

2Amy
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Old 06-09-2019, 09:28 PM   #5
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A stupid question for me but apparently not you. Where do I find these things to look at? Now I am mechanically inclined, and I do believe you when you said that you highly doubt the dealer replaced the whole heater. Cause I can look under the hood and really didn't dee something all new and shiny, Thank you, I will search those items out and u tube them.
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Old 06-09-2019, 09:56 PM   #6
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Ok here goes, directly behind the chassis battery as you open the hood there will be a tall round cylinder with two fittings that is the ac suction a accumulator, now directly behind the battery as you looking at the passenger seat you will see a round tin can looking thing it has a rubber flex tube attached to it that also goes to the air plenum box ( the thing that the blower motor bolts to. Low and to the left Is a wire harness with 5 or so wires on it the connector is white and it looks to be plugged into the heater ac box THAT is the blower resistor pack. Blower motors are available at any parts store, so is the resistor pack, all for E350/450 use the same parts
I hope I helped you out some if not ask again
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Old 06-09-2019, 09:57 PM   #7
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I will take pictures tomorrow for you and point out the componets.
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Old 06-10-2019, 10:20 PM   #8
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Here are some pictures pointing heater a/c blower,resistor pack, and where it is located, the location is behind the E350 450 chassis battery on passenger side frontClick image for larger version

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Old 06-11-2019, 09:30 AM   #9
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Thank You; AV Fordguy.

I do see all that you said and show. So now its time to check it out and see what I can do. If I need you I will contact you.

Thank you.
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Old 06-11-2019, 11:32 AM   #10
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AVfordguy,

Nice job on the instructions.

Any clue why my blower motor will not run when I start my 2016 Expedition and it's real hot in the car? When car cools down, it will come on for a few seconds and shut off. Eventually it will come back on and stay on but sometimes it will cycle several times.

My mechanic has replaced the Blower motor resister connector twice but still have the problem.

Thanks,

Chris
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Old 06-11-2019, 12:04 PM   #11
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Quote:
Originally Posted by WorldCat25 View Post
AVfordguy,

Nice job on the instructions.

Any clue why my blower motor will not run when I start my 2016 Expedition and it's real hot in the car? When car cools down, it will come on for a few seconds and shut off. Eventually it will come back on and stay on but sometimes it will cycle several times.

My mechanic has replaced the Blower motor resister connector twice but still have the problem.

Thanks,

Chris
Manual or electronic temp control?
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Old 06-12-2019, 11:41 AM   #12
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Quote:
Originally Posted by avfordguy View Post
Manual or electronic temp control?
Sorry, electronic.

Thanks,

Chris
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Old 06-13-2019, 12:04 PM   #13
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Thank you AV Ford guy.
Heater fan replaced and all works good now. We will see for how long.

However I have another question similar to my the heater question.

Traveling now and weather turned up warm. My AC now turns itself off for about 30 seconds to 2 minutes and then back on for a while. It does it sporadically.

Wen it was new it did the same thing Ford said that it had to much refrigerant in it. So they took it all out and added proper amount. (Going by work order)

Now I am not mechanically smart on the AC. Any ideas?
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Old 06-13-2019, 01:48 PM   #14
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Originally Posted by 2Amy View Post
Thank you AV Ford guy.
Heater fan replaced and all works good now. We will see for how long.

However I have another question similar to my the heater question.

Traveling now and weather turned up warm. My AC now turns itself off for about 30 seconds to 2 minutes and then back on for a while. It does it sporadically.

Wen it was new it did the same thing Ford said that it had to much refrigerant in it. So they took it all out and added proper amount. (Going by work order)

Now I am not mechanically smart on the AC. Any ideas?
Sounds similar to my problem in my 2016 Expedition. See above
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