Air conditioning doesnt cool consistently

Tiny
BIKER ROB
  • MEMBER
  • 1993 FORD AEROSTAR
  • 120,000 MILES
I have a 93 ford aerostar and im trying to get the ac right it blows real cold sometimes and others pretty warm accelerating and deaccelerating effect it some but it doesnt seem to be situational. The charge is at factory specs and the low side switch is good I was told it may be the orifice tube. I purchased one but im not sure where it goes or if its the problem. My question is do you think thats the problem and how do I swap it out and if you think it isnt what do you think the problem could be
Thursday, August 2nd, 2012 AT 4:22 PM

12 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
How do you know the charge is at factory specs?Also what is the high and low pressure readings at idle with the ac on?
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Thursday, August 2nd, 2012 AT 4:31 PM
Tiny
BIKER ROB
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  • 6 POSTS
I got the specs out of the haynes manual so its set to haynes specs I havent checked the pressures in a few weeks I did it several times over a month period to make sure there wasnt a leak. If I remember corectly it was 42ls and 160hs ambient temp was around 90 I believe
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Thursday, August 2nd, 2012 AT 10:41 PM
Tiny
SATURNTECH9
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That pressure isnt bad but I was refering to how do you know you have the correct charge in the system?
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Thursday, August 2nd, 2012 AT 10:49 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be freezing up due to air and moisture forming into ice on the orifice tube blocking it off-try evacuating the system and see what happens-also do what been suggested by Sat9
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Thursday, August 2nd, 2012 AT 11:02 PM
Tiny
BIKER ROB
  • MEMBER
  • 6 POSTS
The haynes manual for the van I picked up at the auto parts place and checked with a mechanic friend and internet research
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Thursday, August 2nd, 2012 AT 11:03 PM
Tiny
SATURNTECH9
  • MECHANIC
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There is no way I can tell you or a manual can tell you if its over or under charged from the pressure readings. Thats just not possible.
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Thursday, August 2nd, 2012 AT 11:06 PM
Tiny
BIKER ROB
  • MEMBER
  • 6 POSTS
I recon I assume that the pressures I got were suggestions. Im not an auto mechanic especially on ac. If it was on a harley I could. Besides wehther the info I obtained is possible or proper im looking to find out the issue with the ac system
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Thursday, August 2nd, 2012 AT 11:25 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
The pressures are used to diagnose problems with compressures orifice tubes restrictions etc. The pressures sometimes can suggest a over charge or under charge but isnt a given of this pressure is a over or under charge. Before any real diagnosing can happen you need have the ac system checked to make sure it has the correct charge amount.
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Thursday, August 2nd, 2012 AT 11:33 PM
Tiny
BIKER ROB
  • MEMBER
  • 6 POSTS
Sounds good the other part of my question was where is the orphice located my manal failed to include that
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Thursday, August 2nd, 2012 AT 11:35 PM
Tiny
SATURNTECH9
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Its located in the evaporator inlet line.
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Thursday, August 2nd, 2012 AT 11:49 PM
Tiny
BIKER ROB
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Awesome thank you
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Friday, August 3rd, 2012 AT 12:25 AM
Tiny
SATURNTECH9
  • MECHANIC
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Your welcome thats what were here for.
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Friday, August 3rd, 2012 AT 12:28 AM

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