The evaporator temperature sensor can fail, causing the AC compressor not to cycle. If the AC compressor does not turn on, the AC system will not blow cold air. If the compressor is stuck on, the air will be very cold at first, before warming up.
Problems for specific Mercedes-Benz SL500 years:
Car problem reports
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Newest reported 2003 Mercedes-Benz SL500 problems
Xenon bulb was replaced but stopped working immediately. Replace control module (ignitor) for $625 (Mercedes part) + one hour labor.
Replaced and installed at an independant mechanic: Pump $1,600.
The engine may develop a stalling and/or no start condition due to a failed crankshaft position sensor.
The lower control arm bushings can wear and crack, resulting excessive movement at the control arm pivot point, leading to irregular and premature tire wear. Worn Ball joints can also cause similar tire wear symptoms. I some cases it may be necessary to replace the lower control arm, including bushings & ball joint to correct this concern.
The early versions of the central gateway module (which allows different systems to communicate with each other) have software problems.
Leaks in the pneumatic system will cause problems with the dynamic seats and the trunk and/or door closing assist.
An engine Oil leak may develop from the PCV vent housing on the valve cover and/or the inspection plate on the front of the engine.
The rubber bond in the harmonic balancer can decay, which causes the balancer to move and work its way toward the timing cover. If the balancer comes into contact with the timing cover while the engine is running, it will fracture and damage the cover and potentially other surrounding parts. The harmonic balancer should be inspected at every service.
The electrical connector at the automatic transmission may leak fluid into the wiring harness. If not repaired, the oil will migrate through the wiring harness and damage the transmission control module. At that point, a new harness and control module may be necessary to correct this problem.
The brakes may begin to squeak at about the 50 percent wear point. This is due to the size and material used for the brake pads and rotors. The brake rotor surfaces become uneven, causing a lip to form at the outer edge. This will generally require replacement of the rotors when the pads are worn (pad life varies depending on driving style and terrain).
Leaks may develop from the differential cover and/or seals on high mileage or older vehicles. Our technicians recommend a complete reseal of the differential unit if these leaks are addressed.
An engine oil leak may develop from the oil level sensor. Replacement of the leaking sensor will commonly correct this concern.