Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSVOLKSWAGEN2001CABRIO GLX (1V7) L4-2.0L (ABA)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGREFRIGERANT PRESSURE SENSOR / SWITCHLOW PRESSURE SENSOR / SWITCHDESCRIPTION AND OPERATION
2001 Volkswagen Cabrio GLX (1V7) L4-2.0L (ABA)
Low Pressure Sensor / Switch: Description and Operation
2001 Volkswagen Cabrio GLX (1V7) L4-2.0L (ABA)SECTION Description and Operation
A/C Pressure Switch -F129-:
Can be removed and installed without discharging A/C system (Valve under Switch). Make sure O-ring fits properly in groove.
Identified with a green label or the lettering "R-134a."
Functions:
Switches the A/C clutch -N25- OFF if system pressure is too low (low refrigerant charge). For this function, switching takes place between terminal 1 (T4a/1) and terminal 2 (T4a/2).
- Switch opens (compressor OFF): below 1.2 bar (17.4 psi)
- Switch closes (compressor ON): above 2.4 bar (34.8 psi)
Switches A/C clutch -N25- OFF if system pressure is too high. For this function, switching takes place between terminal 1 (T4a/1) and terminal 2 (T4a/2).
- Switch opens (compressor OFF): above 32.0 bar (454 psi)
- Switch closes (compressor ON): below 24.0 bar (348 psi)
Switches the radiator coolant fan -V7- to second speed when A/C system pressure increases. For this function, switching takes place between terminal 3 (T4a/3) and terminal 4 (T4a/4).
- Switch closes (2nd speed ON): above 16.0 bar (232 psi)
- Switch opens (2nd speed OFF): below 12.5 bar (181 psi)
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.