Checking the thermoelectric switch of the L-Jetronic system (BMW 5 Series E12)

Remove the air filter.

Turn on the ignition. As soon as the intake air temperature exceeds approximately 14°C, the switch should close and both its contacts should be energized.

At temperatures below 14°C, only the terminal of the white wire with the green stripe should be energized.

To replace the switch, remove the mounting clamps and pull the switch out.