96 powerstroke idel drop

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Jun 15, 2012 | 10:59 AM

Jusstys

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96 powerstroke idel drop

I turned the heater on in my 96 F250 4x4 Auto Powerstroke Diesel 205,000km today and when I switched to heater control to 'Mix or DEF' and also 'AC or Max AC' I saw a significant drop in idel RPM. I turned it off right away and the idel returned to normal? I tried the heater control again and left it on for 5 seconds and smelt something burning (belt?) but heard nothing squeeling. So I tuned it off. When the heater switch is on 'Floor' or 'Vent' there are no issues (no idel drop or burning smell). Any help or thoughts on the issue would be appreciated. Thanks in advance.

Jun 15, 2012 | 11:12 AM

RÖENTGEEP

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From: Celaya, Gto. MX

Quote:

Originally Posted by Jusstys

Welcome to the forum. Some gurus about A/C will chime in here soon.

Jun 15, 2012 | 11:24 AM

Jusstys

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Thanks RÖENTGEEP, I look forward to being part of the group

Jun 15, 2012 | 11:48 AM

BuckHammer

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Could this be an electrical issue?

Jun 15, 2012 | 12:53 PM

fordman67

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From: evansville in

In ac or def the ac compressor is activated.i would be looking for the smell more than anything.

Jun 15, 2012 | 01:31 PM

yoslick

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From: NW Wisc

Sounds like a locked up A/C Compressor to me, have somebody watch it while you turn your A/C or to defrost setting under the hood..

Jun 15, 2012 | 06:33 PM

Hussler

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From: Medford Oregon

According to my diagrams when in AC (NORM or MAX) or when in Heat (MIX or DEF) the AC compressor is activated, on a 97. My question is why is the AC compressor activated when requesting heat only?

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Jun 15, 2012 | 11:28 PM

ReBilld

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From: Southern West Virginia

Quote:

Originally Posted by Hussler

According to my diagrams when in AC (NORM or MAX) or when in Heat (MIX or DEF) the AC compressor is activated, on a 97. My question is why is the AC compressor activated when requesting heat only?

I'm not sure Jim, but I think it's got something to do with de- humidifing the air.

Jun 15, 2012 | 11:53 PM

#10

oldbird1965

Fleet Owner

Joined: Aug 2004

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From: AZ

It shouldn't be on in heat mode.

Yes, its activited in ac and defrost mode. I think, as yoslick said, your compressor is freezing up and your belt is sliding over it burning.