Air Blend Box


You push a couple buttons or turn a few buttons and voila! You have air that chills your face or air fanning on you feet. But how does this all happen? Well, thanks to the air mixing box. This box lies behind your dash and helps to control the right air temperature. Let’s break it down.

First, Your MA air is circulated through the heating/air conditioning system by the blower fan. Considering on how much hot or cold air there is the fan can blow at distinctive speeds. Having two options, it can either pull fresh air from outside or recirculate air from inside the cabin. WORCESTER drivers often choose to recirculate air when first starting the vehicle until it starts to either cool down or warm up.

Second, the blend box directs air over the heater core to warm the air,  over the air conditioner evaporator core to chill it or a blend of hot and cold to get it just right. From there it can direct the air out into the passenger compartment through the floor vents, the panel vents, the defroster or a combination. This gives WORCESTER drivers the option to customize the climate just the way they like it.

Certain vehicles can also have different climate control zones; one on the driver’s side and one for the passenger’s side – or even for the back seat. More than one blend box is used for this. Depending on your vehicle climate controls can be manually adjusted or computer controlled.

The blower motor and all of the little actuator motors that open and close the various blend doors can fail and need to be replaced. Cabin air filters are now becoming standard in new vehicles.. This filter cleans the air before it gets into the blend box. Do not neglect to change the cabin air filter. If you do it can get clogged, smelly, and even allow mildew and other microorganisms to build up in the blend box.

The pros at AutoPro Import Repair in WORCESTER can perform a heating/air conditioning system cleaning service. This will disinfect and clean the system, restoring a fresh clean odor. If you are not getting enough hot or cold air, your service center can inspect your system, diagnose the cause and set things accordingly. Make sure to replace your cabin air filter on schedule. If you drive in the dusty WORCESTER conditions or where there is a lot of pollen or other pollutants, you may need to replace your cabin air filter more often.

Give us a call.