1994 Mercedes-Benz S420 Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1994 Mercedes-Benz S420
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1994 Mercedes-Benz S420 ProblemsBad Switch/Blower Motor Resistor Assembly May Cause Inoperative Heater Blower Motor
Other than a defective motor, a bad switch or blower motor resistor assembly can cause an inoperative heater blower motor.
A refrigerant leak may develop from one or more of the following AC components: AC compressor, hose manifold for the compressor, or the evaporator core. The loss of refrigerant can cause poor AC performance. Our technicians tell us that proper leak diagnoses should be performed in order to determine the cause of any refrigerant loss.
Ports in the cylinder head related to the emissions air injection and EGR systems can clog; the cylinder head should be removed and the ports cleaned.
1994 Mercedes-Benz S420 Questionshow to bypass security car wont start. cranks but security lights flash and it inhibits it from starting. driver door not closing (1 answer)
little air comes through vents but no heat????