Engine cuts out when climbing a hill

REDPIE88

MEMBER
1996 FORD RANGER
110,000 MILES

I have a 96 ford ranger, 30/6cyl. The A/C cuts out under load. Like whem I climb a hill then comes back on when the road flattens out. Any thoughts?G works fine otherwise

Tuesday, October 18th, 2011 AT 6:16 PM

5 Replies

JACOBANDNICKOLAS

MECHANIC
109,747 POSTS

Does the AC stop working or does the air flow change direction?

SPONSORED LINKS

Was this

answer

helpful?

Yes

No

Tuesday, October 18th, 2011 AT 7:24 PM

HMAC300

MECHANIC
48,601 POSTS

Check to see if you have a switch on the throttle to make it cut off when gas pedal is depressed so far.

Was this

answer

helpful?

Yes

No

Tuesday, October 18th, 2011 AT 7:37 PM

REDPIE88

MEMBER
2 POSTS

I believe it stops working, it blows warm air, Through the defrost vents. Tried to switch back and forth between max and regular air. No luck. It just started doing this. 110,000 miles. Never a problem. Normally blows nice and cold. A few minutes after it's back on level ground it comes back to normal all by it's self. Not enough throtle increse to downshift.

Was this

answer

helpful?

Yes

No

Tuesday, October 18th, 2011 AT 7:47 PM

JACOBANDNICKOLAS

MECHANIC
109,747 POSTS

Check to make sure the blend door actuator is working properly and there are no vacuum leaks in the system. If the blend door closes (up hill causes lower vacuum in engine) due to loss of vacuum, you will lose the AC. Also, usually the default is to the defroster for air flow.

Was this

answer

helpful?

Yes

No

Tuesday, October 18th, 2011 AT 7:53 PM

HMAC300

MECHANIC
48,601 POSTS

Then you are going to have the system checked by a pro for leakage, it sounds as if it may have low pressure or is freezing up which is going to cost you money to have system evaced/charged and a drier replaced at least. Or the compressor kicks out also check the relay that I have showing with a red arrow. It is a wot cutoff relay it may be moving around doing this.

Image (Click to make bigger)