Air Conditioner Blows Hot Or Hot On One Side – Free Car Air Conditioning Help

Car air conditioning systems that get hot on one side and cool on the other generally have one of two problems. In this short auto repair article, a master automotive technician shares his experience, derived from working on air conditioners in Florida for the past two decades. This free information can be just as helpful to the DIYer as it is to a consumer who knows the value of being informed when it comes to dealing with auto repair shops. Read on for free car air conditioning help when hot air blows on ONE side.

Typically, cars that are cooled on one side of the dash and heated on the other side are generally equipped with a dual-zone climate control system. Dual zone systems allow the driver and front passenger to adjust the respective temperatures to their comfort levels. There are two common causes of a temperature difference when both sides are set to the coldest setting, let’s cover the first one.

Low coolant

Automotive air conditioners that use 134A generally contain a small amount of refrigerant compared to older cars that use R12. Today’s car and truck air conditioners are much more efficient than their older counterparts. The fact that 134A systems use less Freon means that a leak can more quickly affect the performance of an HVAC (heating, ventilation and air conditioning) system. Due to the design of dual AC systems, low coolant is the main cause of a drastic temperature difference from one side of the board to the other. Even very experienced auto mechanics may be surprised to learn that just 4 to 8 ounces of less charged 134A can make a big difference. The temperature from the left to the right vent can vary from 10 to 20 degrees. The easiest thing to try is to complete the system or, better yet, remove all the freon and recharge the unit with the factory specified amount. In most cases, after the proper freon charge is in the car, the temperature will be as cold as it should be on BOTH sides!

What if that didn’t help? Read on for another possible cause of the problem.

HVAC door problem

Dual zones supplying different temperatures from the vents on both sides of the dash is achieved through the use of small doors within the HVAC enclosure. By controlling the doors, the left and right air temperature can be adjusted to the desired comfort level. Many times the motor (or actuator) that controls the door on either side can fail or the door itself can break and avoid temperature. to be adjusted. Diagnosing this problem is more complex and may be the subject of another article. Thank you for reading. Hopefully the free information provided here will help remedy the “air conditioner blowing hot or hot from one side of the dash” problem.

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