A/C stops blowing

Tiny
STNR4U2
  • MEMBER
  • 1995 FORD F-150
  • 5.8L
  • V8
  • 4WD
  • AUTOMATIC
  • 225,000 MILES
A/C stops blowing after a certain speed or when going uphill.
Monday, May 28th, 2018 AT 12:20 AM

2 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

I would start by checking the connection at the blower motor itself. It is common for this to be hot and bad connection results.

Roy

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only
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Tuesday, May 29th, 2018 AT 9:01 AM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
Maybe it is still going but not getting through to you?

I am sort of looking at the possibility of low vacuum to the HVAC controls, sort of "defaulting" the door(s) to another position.

A few possibilities might be:

Engine wear/need of a tune up/possible vacuum lines broken or cracked or not attached. If there is a vacuum reservoir, maybe it is not hooked up.

A vacuum gauge hooked to the intake and ran back into the cockpit might show what the actual vacuum is when this is happening.

I have a "shop gauge" for tuning and one mounted on each of my Jeep dashes. Vacuum gauges are great diagnostic tools for an engine before tearing into one!

Here is a guide for vacuum leaks:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Keep us posted, if you need more information let us know.

The Medic
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Tuesday, May 29th, 2018 AT 3:35 PM

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