Air Conditioning Blows Hot Or Warm on One Side – Free Car AC Help

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.

Usually cars that blow cold on one side of the dash and warm on the other side, are typically equipped with a dual zone climate control system. Dual zone systems allow the driver and front passenger to adjust respective 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 first 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. Due to the design of dual AC systems, low refrigerant is the leading cause of drastic temperature difference from one side of the dash to the other. Even well experienced car mechanics may be surprised to learn that as little as 4 to 8 ounces undercharged of 134A can make such a huge difference. The temperature from the left vent to the right vent can vary 10 to 20 degrees. The easiest thing to try is to top off the system or better yet, remove all freon and recharge the unit with the factory specified amount. In most cases after the proper charge of Freon is in the car, the temp will blow equally as cold like it should on BOTH sides!

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

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 this problem is more complex and can be a subject for another article. Thanks for reading. Hopefully, the free information provided here will help to remedy the problem of “AC’s blowing hot or warm from one side of the dash.”

Find the Free Auto Repair Manual You Need Online

You can easily get a free auto repair manual for whichever repair need you might have. You need an internet access and have to follow a certain procedure searching for auto repair manuals, but when you have done this procedure a few times it will be very easy to find the right instructions for do it yourself auto repair and it won’t cost you a dime.

There are four types of automotive description documents that you will need to choose from when you want to do a repair;

  • General manuals
  • Diagnosis descriptions
  • Repair manuals
  • Maintenance manuals

General Manuals

In addition to some general manuals, most of these are related to the make. Here you can get step by step guidance on how to repair most of the makes in the vehicle market. Let’s say you have a Honda Acura 2002 model and you want to find a manual for that make and model. What you do is perform the following search in a search engine: “free car manuals+Honda Acura+2002”. Then you will have a long list of sites that provide you with all kinds of descriptions for your Honda Acure 2002 model, and you can choose what you want.

Diagnosis descriptions

Automotive diagnosis manuals can also be sub-divided by make and model. But it can also be divided by the area of the vehicle that is affected, for example engine intake problems, brake problems, cooling problems, exhaust problems, start or stall problems, transmission problems etc. Let’s say you have a start problem. Your search would be “car diagnosis manual+ start problem”, then you should get more than enough repair information to choose from. You can even get diagnostic trees where all options are covered for nothing.

You have probably more than one time heard some annoying noise from somewhere in your vehicle, without finding the source of it. This is one of the most kinky situations to run into because you don’t know if it is a serious signal or just a small thing. Some websites gives you the opportunity to diagnose vehicle problems by the noise, sound and vibrating signals – and that is great. The sooner you find it the sooner you can fix it and then you can relax. When you search, you can describe the sound, for example “whine noise” or “shifter knocks” or “driveline vibration” plus car diagnosis manual plus eventually the make.

Repair Manuals

In addition to regular manuals you can also get very instructive and detailed descriptions in other internet document or websites like articles, etc. The natural way to sub-divide such repairs before searching, is by the area of the vehicle that is going to be repaired, for instance body repair, exhaust repair, suspension fix, interior repair and even general car repair.

You do the search the same way as above; “car repair manual (or description) + the area of repair and go through the list of resources you get.

Maintenance manuals

Though vehicle maintenance is closely related to your vehicle make and model, there are some maintenance issues that are pretty much common whether you have a Cadillac, VW or a Mercedes, for example changing oil, changing air filters, engine wash, fluid maintenance, tier maintenance etc. You can get access to maintenance descriptions by searching for the kind of maintenance plus “car maintenance manual (or description)” plus eventually your make and model.

I think you’ll be amazed of the amount of automotive repair free stuff online.