1996 Volkswagen Golf A/C-Heater System Manual

COMPRESSOR CLUTCH CONTROL
Evaporator Temperature Switch
Although compressor clutch does not normally cycle on and off, an evaporator temperature switch turns off the compressor clutch if evaporator temperature decreases to 32øF (0øC). This prevents evaporator icing.

A/C Pressure Switch
A/C pressure switch is a triple-pressure switch, which monitors high side pressure. See Fig. 1. If pressure decreases to less than 17.4 psi (1.2 kg/cmý), A/C pressure switch interrupts power to compressor clutch (low-pressure cutout). Switch closes when pressure increases to more than 34.8 psi (2.4 kg/cmý).

If pressure increases to more than 464 psi (32.6 kg/cmý), A/C pressure switch interrupts power to compressor clutch (high-pressure cutout). Switch closes when pressure decreases to less than 348 psi (24.5 kg/cmý).
A/C pressure switch also controls cooling fan high speed operation. If pressure increases to more than 232 psi (16.3 kg/cmý), switch contacts close, causing cooling fan to operate at high speed. When pressure decreases to less than 181 psi (12.7 kg/cmý), switch contacts open.
Ambient Temperature Switch
If ambient temperature decreases to less than 36øF (2øC), ambient temperature switch interrupts power to compressor clutch. When ambient temperature increases to more than 45øF (7øC), ambient temperature switch restores power to compressor clutch.

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1992-2003 Volkswagen Golf, Jetta, GTI, Cabrio Heating Air Conditioning 87 - A/C controls and mechanical components, servicing

Installing and checking expansion valve insulator
1. Insulator
2. Expansion valve
Insulation is used around expansion valve to prevent moisture (condensation) build-up and to protect expansion valve from high engine compartment temperatures and the resulting decrease in A/C system cooling performance.
Install insulator - 1 - over expansion valve - 2 - (arrow).
Check insulator for damage and proper fit, and replace if necessary.

Removing and installing evaporator water drain valve
1. Water drain valve
2. Bulkhead
3. Water drain tube (on evaporator housing)
4. Mounting recess
To remove, carefully pull water drain valve - 1 - from drain tube - 3 - .
Install water drain valve so that valve flap opens from bottom.
Make sure valve flap is free of dirt, wax or undercoating; clean if necessary.

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