New Member Heater

[Elkaholic65]

I have 2001 f350 super duty 7.3 litre deisel about two days ago the heater and ac stopped blowing through all ports except defrost can anyone tell me why this is?

 

[BIG JOE]

I have 2001 f350 super duty 7.3 litre deisel about two days ago the heater and ac stopped blowing through all ports except defrost can anyone tell me why this is?

Defrost is the default setting.. for a Vacuum failure. Check the fuse that controls the Vacuum Pump, then check the Vac line from the Vac pump/accumulator.. to the manifold located behind and to the left of the Glove box... for leaks and good connections.

4X4 ? check/inspect the vac lines at the front Hubs.

Joe

Whoops.. OBTW ? WELCOME to SDD

 

[Deerjager]

Welcome to SDD. Check vacuum hoses for cracks as well.

 

[DaveBen]

Elk.

Dave

 

[WD40]

Welcome to SSD.com
Doug

 

[atk]

Welcome to SDD......

 

[02SilverStroke]

Welcome aboard!!! Here's another vote for the vacuum failure.