AC works good on highway speeds . But at a stop or idel. It blows warm air. What are thinking i need to look for?

60

Asked by May 08, 2015 at 07:11 PM about the 2008 Ford F-450 Super Duty Lariat Crew Cab 4WD

Question type: Maintenance & Repair

Took it to a mechanic He put on ac gauges
and said theres a restriction in the system it
gave a high psi reading.over 250pis

12 Answers

69,405

Sounds like there's air in the system or the condenser (in front of the radiator) is dirty and blocking the airflow. Does the coolant temp gauge climb at idle as well? If so, the condenser is blocked. HTH. -Jim

1 of 1 people found this helpful.
60

no temperature stays the same This happened after idle Ac pully tensioner bearings Went out I replaced the pulley

1 of 1 people found this helpful.
67,555

Sound,s like the AC system is low on freon,and high on air,

60

Well i took it to a shop had a mechanic Put gauges red gauges gave a reading over 250psi. He said theres a restriction in the system.. That i would have to take it to the dealer ship

1 of 1 people found this helpful.
67,555

This can be caused by over filling with freon all so,

67,555

At low idle it will cut off compressor,

67,555

It explainotory,run,s good on high way,but off at idle,go have the sytem vacummed,and filled proper.

60

Ive had the truck for over a year ac has been working fine. Till now.. Would it be best to change out orifice tube as well?

69,405

Is the diameter of the new pulley the same as the old one? If it's larger the compressor will spin slower than it's supposed to. If this is happening the compressor won't "pump" as well as it should. At idle it will be more noticeable. What's the low side pressure reading? HTH. -Jim

60

Yes new pully is the same size. Not sure what the low reading was. But tomorrow morning will get a second opinion at midas they have free ac inspections

1 of 1 people found this helpful.
60

Ok i figured out the problem electrical connections On the fan clutch wasn't seated properly .made the corrections.all works great now .thanks for yalls in puts.

1 of 1 people found this helpful.
67,555

Good to know mlopez38,another good answer to add to the book,s.

Your Answer

F-450 Super Duty

Looking for a Used F-450 Super Duty in your area?

CarGurus has 2,519 nationwide F-450 Super Duty listings starting at $8,481.

ZIP:

Ford F-450 Super Duty Experts

  • #1
    F_O_R
    Reputation
    60
  • #1
    gorsmar
    Reputation
    60
  • #3
    mlopez38
    Reputation
    40
View All

Related Models For Sale

Used Ford F-350 Super Duty
339 Great Deals out of 23,619 listings starting at $1,895
Used Ford F-250 Super Duty
357 Great Deals out of 43,715 listings starting at $1,250
Used Ford F-150
2,235 Great Deals out of 183,025 listings starting at $1,500
Used Dodge Ram 3500
93 Great Deals out of 2,193 listings starting at $4,993
Used Chevrolet Silverado 3500HD
116 Great Deals out of 10,254 listings starting at $5,995
Used GMC Sierra 3500HD
59 Great Deals out of 4,276 listings starting at $9,950
Used Chevrolet Silverado 2500HD
320 Great Deals out of 29,162 listings starting at $2,650
Used GMC Sierra 2500HD
100 Great Deals out of 13,281 listings starting at $4,450
Used Dodge Ram 2500
151 Great Deals out of 5,094 listings starting at $2,999
Used Chevrolet Silverado 1500
2,134 Great Deals out of 183,037 listings starting at $1,898

Used Cars For Sale

2017 Ford F-450 Super Duty For Sale
1,277 listings starting at $33,570
2016 Ford F-450 Super Duty For Sale
3 Great Deals out of 231 listings starting at $39,950
2015 Ford F-450 Super Duty For Sale
54 listings starting at $26,990
2014 Ford F-450 Super Duty For Sale
47 listings starting at $23,995
2013 Ford F-450 Super Duty For Sale
4 Great Deals out of 38 listings starting at $22,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.