BMW Climate Control Diagnostics: Resolving Cooling System Problems Speeds Repairs Cheshire CT
BMW has used the same basic system for the last 25 years or more for regulation of interior temperature, window defrosting and ventilation. The focus of this article will be the 3 and 5 Series cars of the last 15 years, but the information on repair and diagnosis is applicable to all models. Like a jigsaw puzzle, there are a lot of pieces to this system, but when they are all put together, the picture on how it all works is pretty clear.
AutoZone
(203) 265-6112
456 N Colony St
Wallingford, CT
Maaco Auto Body Shop and Collision Center
203-879-2596
31 Nutmeg Valley Rd
Wolcott, CT
Maaco Auto Body Shop and Collision Center
203-879-2596
31 Nutmeg Valley Rd
Wolcott, CT 06716
Hours
Mon-Fri :8AM - 5:00PM
Sat:9AM - 12:00 Noon
Sun:Closed
AutoZone
(203) 723-1796
72 Bridge St
Naugatuck, CT
AutoZone
(203) 573-9338
564 W Main St
Waterbury, CT
Maaco Auto Body Shop and Collision Center
203-787-6550
991 Dixwell Avenue
Hamden, CT
Maaco Auto Body Shop and Collision Center
203-787-6550
991 Dixwell Avenue
Hamden, CT 06514
Hours
Mon-Fri :8:30am to 5:30pm
Sat:9:00am to 12:00 noon
Sun:Closed
AutoZone
(203) 237-1011
140 W Main St #150
Meriden, CT
AutoZone
(860) 621-8908
60 Interstate Park Drive
Southington, CT
AutoZone
(203) 573-1333
850 Lakewood Drive
Waterbury, CT
AutoZone
(203) 785-9435
975 Dixwell Ave
Hamden, CT
AutoZone
(860) 346-0564
926 Washington St
Middletown, CT
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First Speeds Repairs There was a time when the heating and ventilation system on most cars was simple. A three-position switch, 
a couple of levers and maybe some separate vents that would allow outside air to enter the passenger compartment. Times have changed and today’s car buying public wants to dial in a desired temperature and turn over regulation to a processor (See Photo 1). Many cars have multiple-zone HVAC systems where different temperatures can be dialed in for certain areas of the car interior. BMW has used the same basic system for the last 25 years or more for regulation of interior temperature, window defrosting and ventilation. The focus of this article will be the 3 and 5 Series cars of the last 15 years, but the information on repair and diagnosis is applicable to all models. Like a jigsaw puzzle, there are a lot of pieces to this system, but when they are all put together, the picture on how it all works is pretty clear. 
COMPONENT PARTS
Beyond the obvious parts of the HVAC system, the radiator and heater core, blower motor, A/C evaporator and condenser, there are other components that help regulate the interior temperature regardless of the outside conditions. On all of these models, there is an auxiliary coolant pump, a switching valve assembly and various temperature sensors, flap actuators and a control head and processor (See Photo 2). Later models will have at least one cabin or pollen filter, and some will have two ... |
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