Testing—Tac System; Air Cleaner With Trap Door - Jeep J-10 Series 1982 Technical & Service Manual

Table of Contents

VALVE (OPEN)

AIR VALVE CLOSED

(HEAT OFF POSITION)

FUEL SYSTEMS

VALVE (CLOSED)

AIR VALVE OPEN

(HEAT ON POSITION)

Rg. 1J-151 TAC System—Typical—Six- and Eight-Cylinder Engines

thermal sensor opens the vacuum to the atmosphere.

This allows spring pressure to force the valve to the heat

Off position. In this position, air flows from outside the

vehicle, through the ambient air duct, to the air cleaner.

During hard acceleration, manifold vacuum drops.

This causes the air valve to move to the heat Off posi

tion, regardless of air temperature, to provide maximum

TESTING—TAC SYSTEM

(1) Remove air cleaner assembly from carburetor

and allow to cool to room temperature.

(2) After cooling, sight through air cleaner duct to

observe position of air valve. It should be fully open to

outside ambient air (heat Off position).

(3) Install air cleaner assembly on carburetor and

connect heated air tube and manifold vacuum hose.

WARNING: Use extreme caution when engine is oper

ating. Do not stand in direct line with fan. Do not put

hands near pulleys, belts or fan. Do not wear loose

(4) Start engine and observe position of air valve. It

should be fully closed to outside (ambient) air (heat On

VACUUM MOTOR

Rg. 1J-152 Air Cleaner with Trap Door

Troubleshooting