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 MANUALSVOLKSWAGEN2002JETTA GLS, 4D SEDAN, 1.8 D, AUTOMATICREPAIR AND DIAGNOSISENGINE MECHANICALCOOLING SYSTEM (MECHANICAL)1.8L - COOLING SYSTEM - AWD, AWW, AWP (A4 PLATFORM)COOLING SYSTEM COMPONENTS, REMOVING AND INSTALLINGAFTER-RUN COOLANT PUMP, CHECKINGTEST SEQUENCE
2002 Volkswagen Jetta GLS, 4D Sedan, 1.8 D, Automatic
Test sequence
2002 Volkswagen Jetta GLS, 4D Sedan, 1.8 D, AutomaticSECTION Test sequence
- Pull 2-pin connector off After-Run coolant pump -V51- -arrow-.
- Connect contacts of After-Run coolant pump -V51- to battery using aux. cables from V.A.G. 1594. After-run coolant pump must run.
If the after-run coolant pump does not run:
- Replace After-Run coolant pump -V51-.
If the After-Run coolant pump -V51- runs:
- Switch ignition off and on again.
- Connect VAG 1527B voltage tester to disconnected connector for after-run coolant pump (V51) with auxiliary cable from V.A.G. 1594 A LED must light up.NOTE: This check must be performed within 5 minutes after switching ignition off.
RENDER: 1.0x
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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.