Shifting issues due to internal problems in high mileage automatic transmissions can be difficult to resolve without transmission replacement.
Problems for specific Volkswagen Jetta years:
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Most reported 1991 Volkswagen Jetta problems
Reverse gear failures and noise in the manual transmission models are common.
Electrical issues that are difficult to diagnose—and sometimes intermittent—are typically due to ground wiring issues. The most troublesome ground locations are under the battery or at the engine.
Heater core leaks are common in this model, more so if the wrong anti-freeze/coolant is used in the cooling system.
Ignition wire breakdown is common, resulting in misfires.