Car has vaccuum leak(s). If you remove the panel under drivers foot area, look to the center area. You will see some vacuum chambers with different color vacuum lines running to them. the yellow one is faulty 80% of the time. Carefully remove it and plug the line itself. you dont need to plug the chamber. this should fix problem, and you wont notice any function lost on climate system.
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Most cars have whats called flow thru ventilation. The fan runs on low speed in the off position to pull fresh air thru the passenger compartment. It would be outside air so the air temp coming thru the vents would match the outside air temp.
The actuator door that is behind the dash that closes off the heater core from shooting hot air thru the vents might be your problem. When you turn on your ac the actuator shuts the door to prevent the air from flowing thru the heater core into the cabin, this may be your problem if everything else is working properly. Let us know.
Sounds like a blend door problem. The vacuum from the engine opens and closes the door that directs air flow thru the vents. I would guess the door is stuck in the middle of the range or something is blocking it. The blend door(s) is behind the glove box.
Usually a blend door problem. The system is designed to default to the defrost position for safety. If the blend doors are vac operated, look for a vac leak. If electric, look for a failed motor or stuck door.
Faced similar problem. Open up the dash, change all the 4 vacuum bellows and the 2 vaccum hoses connected from the firewall to the bellow on the driver's side. Also replace the 2 valve in the hood which are connected into the firewall. Problem of losing air during acceleration solved.
This does not seem logical as the AC compressor is run off of a belt attached to the engine. If you hear the fan spinning and can hear the relay click when the AC is turned on, it is engaging properly. If you run the AC full blast for about 10-15 minutes and look under the hood you should be able to find the lines for the AC and see some condensation on one portion and feel heat coming off the other portion. The AC line should be a relatively thin silver colored pipe with 2 fittings on top, one high pressure and one low pressure. Assuming everything is running as it should, and the AC is simply not cold (which is the most common problem), you can buy an AC recharge kit at your local auto parts store. Depending on the year of the car, you may need to bleed the system of the old refrigerant as they changed the standard freon used in recent years. The only moving parts in the system are the fan and compressor, so if there is a drop in speed, it will be one of these components.