Why is my 2008 Kia Sorento blowing hot air?

SOURCE: A/C blows hot air. gas checked and it is full,

disconnect battery for a few minutes then hook it back up. Hope this helps Tim

SOURCE: AC not running in my 1998 Jeep Cherokee. Changed

Hello, You have two switches which work off the pressure of the Freon. Both of these switches cut off the power to the compressor. One is for HIGH pressure and the other is for LOW pressure. Check for power at the compressor clutch connector harness while the controls are set and the engine is running. You may have power and a bad clutch.

When you say that the Freon pressure is good, does that mean the pressure is within the proper range? Too much Freon will make the HIGH switch cut off power and too little will make the LOW pressure switch cut off power.

The ideal amount(ozs) of Freon is what is recommended by the Manufactuer and it will provide a moderate amount of pressure of about 35psi-40psi. You can borrow pressure gauges, called Manifold gauges to measure your system at autoparts stores with loaner programs.

The low pressure side of the system is the one you use to induce the Freon to go into an empty system. You can bypass this switch by taking off the connector and putting a "U" shaped jumper into the harness and the compressor clutch should get power to LOCK up all of the time.

You can take off the switch connector at the compressor clutch and then check for power when bypassing the HIGH pressure switch if the LOW pressure switch does not make the system get power. Only, really only bypass the HIGH pressure switch with the clutch connector disconnected. The HIGH switch is there to prevent damage to all of the components from seals to lines to every piece of Freon hardware in the car. Bypassing with the A/C clutch disconnected will allow you to know if power is getting to the compressor clutch.

Finally, you can get FREE wiring and fusebox diagrams through Autozone.com. Just sign and register to their site and then you can print the documents for yourself.

Good luck with this repair and I hope my solution helps you.

Richard Conbere

• 554 Answers
• Posted on Jul 01, 2015

SOURCE: I have a 2008 Honda Civic which blows cold hair at first and then starts blowing warm air.

It sounds like you are just tossing parts on it, not diagnosing it first. Sometimes it is cheaper to pay a professional. Does the compressor stay running when it isn't cold? If so, is the return pipe, (the large 1) cold? When you replaced the freon, was it evacuated proprely, with a vacuum pump, for at least 20 minutes at -28 psi vacuum? If the compressor turns off when it gets warm, is power still going to the compressor? If it is, the magnetic coil is failing and/or the clutch gap has become excessive, not unusual on higher mileage Hondas. Your question about the fuse baffles me, why even ask, just replace it with a spare fuse.

Testimonial: "Yes the compressor is running but the condensor fan randomly goes on and off. No I did use a vacuum pump . Imma just go ahead and replace the condensor fuse anyway at least I'll have new parts."

SOURCE: Air conditioner blows heat, conditioner was charged, freon, checked relay switch, fuse, door blend alol fine still hot air, was told maybe a block in V shape hose is it temp control value Help

Only way to tell if A/C Evaporator Core Orifice tube is plugged is by looking at A/C gauge readings , An if it is plugged you more then likely need a new compressor , they become plugged with metal particles from worn out compressor. Your best bet would be to take your vehicle to a qualified repair shop .