Diagnose A Problematic Air Conditioner - Why Is Warm And Cold Air Coming Out?

Car air conditioning systems that blow warm on one side and cold on the other side usually 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 last couple of decades. This free information can be equally helpful to the do-it-yourselfer as it is to a consumer that knows the value of being informed when it comes to dealing with car repair shops. Read on for free car A/C help when the air is blowing warm on ONE side.

Typically automobiles that blow cold on one side of the dash and warm on the opposite side, are sometimes supplied with a twin sector climate control system. Twin area systems permit the driver and front passenger to adjust particular temperatures to their comfort levels. There are two common causes of a temperature difference when both sides are set at the coldest settings, lets cover the 1st one.

Low Refrigerant - Automotive air conditioners which use 134A, usually hold a small amount of refrigerant compared to older automobiles that use R12. Car and truck air conditioners today are much more efficient than their older counter parts. The fact that 134A systems use less freon, means that a leak can more quickly affect the performance of an HVAC (Heating Ventilation & Air Conditioning) system.

Thanks to the design of twin AC systems, low refrigerant is the main cause of extreme temperature difference from one side of the dash to the other. Even well experienced auto technicians could be stunned to find out that as little as four to eight oz undercharged of 134A can make such a massive difference. The temperature from the left vent to the right vent can vary ten to twenty degrees.

The best thing to try is to top off the system or better remove all freon and recharge the unit with the factory stated amount. Mostly after the correct charge of Freon is in the vehicle, the temp will blow similarly as cold like it should on either side! What if that did not help? Read on to learn of another possible cause of the difficulty.

HVAC Door Issue - Dual zones supplying different temperatures from vents on either side of the dash is achieved by the use of small doors within the HVAC housing. By controlling the doors, the temperature of the air on the left and right can be adjusted to the desired comfort level. Many times the motor (or actuator) that controls the door for either side can fail or the door itself can break and prevent the temp. from being adjusted.

Diagnosing that issue is more complicated and could be a subject for another article. Thanks for reading. Hopefully, the free info supplied here will help to fix the issue of "AC's blowing hot or warm from one side of the dash. ".

by: Delia Mashindo

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