Download Free 1996 Volkswagen Golf AC Heater System Manual.pdf System uses R-134a refrigerant. Variable displacement compressor increases or decreases pressure as necessary to maintain evaporator temperature near 32øF (0øC). Expansion valve restricts refrigerant flow, causing pressure differential. 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 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.
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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.
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