Buy OEM Mercedes-Benz A/C and Heating Parts
The heater in your Mercedes-Benz not warming things up? Maybe the air conditioner isn't blowing cold? Most likely, one or another part needs replacing -- something you should do sooner rather than later, to keep spiraling repair costs down. Good thing you came to us here at MB Part Source; we stock replacement heating and AC parts for all Mercedes-Benz models, at competitive prices. Order today, and we'll ship fast, anywhere nationwide; you'll have repairs done in no time. Contact us with any questions.
Cable Lug, Special Form
Mercedes-Benz
002-982-21-02
Electric cable to heater plug.
$8.09
MSRP $11.00
Save $2.91
26.5% Off 
Seal
Mercedes-Benz
126-835-02-98
Air-blast nozzle to heater case.
$0.41
MSRP $0.60
Save $0.19
31.7% Off 
Control Unit
Mercedes-Benz
126-820-18-26
Seat heater control. Below rear seat.
$79.20
MSRP $110.00
Save $30.80
28% Off 
Valve
Mercedes-Benz
124-800-06-78
At air conditioner case or heater case.
$163.02
MSRP $240.00
Save $76.98
32.1% Off 
Screw
Mercedes-Benz
124-990-03-20
Operating unit to heater case. Blinker switch.
$1.23
MSRP $1.70
Save $0.47
27.6% Off 
Hose
Mercedes-Benz
124-832-00-88
Air guide. Between heater case and left nozzle.
$0.98
MSRP $1.40
Save $0.42
30% Off 
Socket Nut
Mercedes-Benz
094-994-52-00
Bracket to heater case. Heater case to tunnel.
$5.29
MSRP $7.25
Save $1.96
27% Off Air Duct
Mercedes-Benz
124-831-09-46
Between heater case and left nozzle, on nozzle.
$9.84
MSRP $13.50
Save $3.66
27.1% Off 
Hexagon Head Bolt
Mercedes-Benz
304017-006020
M6x20. At air conditioner case or heater case.
$2.58
MSRP $3.50
Save $0.92
26.3% Off Switchover Valve
Mercedes-Benz
000-800-11-78
At air conditioner case or heater case. Backrest locking mechanism.
$34.44
MSRP $47.00
Save $12.56
26.7% Off 
Receptacle Housing
Mercedes-Benz
013-545-23-28
Mode indicator switch anti-theft alarm system. Seat heater switch.
$2.58
MSRP $3.50
Save $0.92
26.3% Off 
Valve
Mercedes-Benz
000-800-05-78
At air conditioner case or heater case. Evaporator case. Backrest locking mechanism. Heater housing.
$40.80
MSRP $57.00
Save $16.20
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Mercedes-Benz AC and Heating FAQ
Why is the HVAC in My Mercedes-Benz Not Working Right?
Most likely, because of low or leaking coolant, a failed heater core, a defective AC compressor, or a bad AC condenser. You'll know one from the other by some key symptoms.
How Can I Tell if My Coolant's Low or Leaking?
Start your engine, setting the air conditioner and fans to max/high and listening for the compressor clutch to click. If the system runs too fast, the coolant's probably low. If your Mercedes-Benz isn't due for air conditioning service anytime soon, a leak's likely.
What are the Signs of Heater Core Failure?
The heater not blowing warm, the interior being steamy or smoky, the smell of coolant in the car, and the engine overheating. The core's hoses are the likely problem; they're probably leaking. If you need help with this or any other repairs, get in touch with a Mercedes-Benz service center.
How Can I Diagnose an AC Compressor Defect?
Look, listen, and feel. If the air conditioning sounds funny, if the cabin's warmer than usual, and if the AC clutch is stuck, it's probable. You'll know a bad clutch from connecting a voltmeter and getting no reading. Other causes of compressor trouble include low refrigerant pressure, a faulty cycling switch, and a blown fuse.
How Can I Tell if the AC Condenser in My Mercedes-Benz is Bad?
You'll know it from the HVAC warning light being lit, from frost starting to build up, from the AC button flashing, from the system having discharge pressure issues, and from the vents not blowing cold. If no air's coming through them at all, though, the blower motor's probably gone out. Other reasons for condenser issues include a failed cooling fan and a clogged cabin air filter.