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

75,375

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.
71,985

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.
71,985

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

71,985

At low idle it will cut off compressor,

71,985

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?

75,375

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.
71,985

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

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