Functional Description

Functional Description

The delay device Q42, located in group Q41, controls the cutting in of the electric fan to improve the cooling of the air conditioning system compressor. The "activated" voltage (line protector) fuse F15 (10A) of G1 supplies the coil and the electronic delay devices Q42 pin 66. The coil is activated by an earth signal - pin P - which can come from either the trinary pressure switch Q20, or from level 1 (87-92°C) of the two-stage thermocontact L33: this causes an ground signal to be sent - pin 30- to the additional resistance O22 and from there to the electric engine cooling fan P2, which is then operated at the 1st speed.

The electric fan P2 is constantly supplied by battery voltage through the special fuse, Q254 (40A). After about 10 seconds, if the control signal persists, or if level 2 of thermocontact L33 is reached (92-97°C), the delay device Q42 sends -pin 66- an ground signal which excites the coil of the fan relay I1, and activates the fan itself P2 at the 2nd speed.

Components and Connectors

Fusebox	G1 B	Fusebox	G1 H
Engine compartment ground - right side	G53a	Engine compartment ground - left side	G53b