Why does my AC in my car only work sometimes?

Intermittent cooling is often caused by the components of your vehicle’s AC system freezing up. Typically an iced over evaporator is the culprit. There may be numerous issues causing the icing—from a dirty cabin air filter to a blocked evaporator drain or an overcharged system.

Why does my AC go from cold to warm?

If your A/C flip-flops from hot to cold and back again, your expansion valve could be failing. The expansion valve distributes the proper amount of refrigerant to your evaporator. If the valve is blocked, the refrigerant flow could be restricted or could be too unrestricted. Your A/C blows warm air.

What happens if you overcharge your AC in car?

If the AC system is overcharged, the change from liquid to gas cannot happen, so the compressor starts producing liquid coolant instead of gas. It now has to work extremely hard to pump the excess coolant through the lines. The result is a noisy or broken compressor.

Who checks AC free?

Before summer begins or if you’re A/C is blowing hot air, come to a participating AAMCO center for a FREE check.

Why does my car a / C stop working after a few minutes?

There are several possible causes of a vehicle’s air conditioning system to stop working after being on for only a few minutes. Basically the causes are either the A/C evaporator is getting too cold and icing up or there’s an electrical problem causing an open circuit. My Parents Chevy Had this Problem Long before I knew anything about A/C.

Why is my car AC blowing cold today but warm Tomorrow?

Blowing cold today but warm tomorrow? One of the most difficult automotive air conditioning problems to diagnose is an intermittent A/C problem. In other words, one day your car’s A/C is blowing cold air, the next day it’s warm air.

What do you need to know about car AC?

First of all, the basics have to be right. This means ensuring that that the refrigerant system is fully charged, there are no leaks, and that the pressure readings are within the specifications. Next the electronics are checked for fault codes and any other saved data.

How does a / C work on a Dodge Ram?

Here’s how those sensors work. The PCM supplies power to the A/C switch in the heater control head on the light green/white wire. When you turn the A/C switch to ON or MAX, the switch completes the path to ground on the black/orange wire terminating in the center of the dash. The PCM sees the voltage drop and that’s its signal that you want A/C.

Why does my car air conditioner blow cold then warm?

Any number of culprits could be causing your car A/C to blow cold then warm air, including: A Leak in the A/C System A small refrigerant leak is the most common reason a car’s A/C gradually loses its cool.

What to do when your car AC is running?

Check the radiator fans to make sure at least one fan turns one when the AC is switched on. However, some cars operate both fans at low speed while driving and switch into high speed mode when the AC is running. So get tricked into thinking your fans are ok simply because they’re running.