Air Injection (Pump Type): Description

NOTE: Federal B2000 models use a reed valve-type air induction system. See appropriate article in this section.

The air pump air injection system is designed to reduce hydrocarbon (HC) and carbon monoxide (CO) content of exhaust gases by injecting a controlled amount of compressed air into the exhaust manifold.

System components and application vary among models. Components of system are a belt-driven air pump with integral relief valve, air control valve with 2 relief valves, air switching valve (except B2000), 2 water thermo valves (1 on B2000; 1 water thermo valve and 1 water thermo switch on 626), vacuum delay valve, check valve (except B2000) and various hoses and piping. A heat hazard warning system is used on GLC Wagon and 626 models to prevent exhaust system overheating.