BMW Climate Control Diagnostics: Resolving Cooling System Problems Speeds Repairs Fresno CA
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
(559) 243-9192
2612 N Blackstone Ave
Fresno, CA
AutoZone
(559) 230-0570
3102 Gettysburg Ave.
Fresno, CA
AutoZone
(559) 225-1937
5384 N Blackstone Ave
Fresno, CA
Maaco Auto Body Shop and Collision Center
559-291-1111
2356 N. Clovis Avenue
Fresno, CA
Maaco Auto Body Shop and Collision Center
559-291-1111
2356 N. Clovis Avenue
Fresno, CA 93727
Hours
Mon-Fri :7:00AM - 6:00PM
Sat:8:00AM - 12:00PM
Sun:Closed
AutoZone
(559) 455-1805
927 S Clovis
Fresno, CA
AutoZone
(559) 252-7327
4210 E Belmont
Fresno, CA
Maaco Auto Body Shop and Collision Center
559-439-0339
6750 N. Blackstone Avenue
Fresno, CA
Maaco Auto Body Shop and Collision Center
559-439-0339
6750 N. Blackstone Avenue
Fresno, CA 93710
Hours
Mon-Fri :6:00AM - 6:00PM
Sat:9:00AM - 2:00PM
Sun:Closed
AutoZone
(559) 264-2893
820 E California A
Fresno, CA
AutoZone
(559) 276-1612
6340 N Figarden Dr
Fresno, CA
AutoZone
(559) 266-1391
2615 S Chestnut Ave
Fresno, CA
Provided By: 
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 ... |
Click here to read the rest of the article at Tire Review
