1

The water temperature gauge on my Mk3 Vauxhall Astra 1.4 (C14SE engine) does not move at all when the car is started - it stays at the bottom (indicating less than 70 degrees).

I would like to fix this so that I can see if the car is overheating.

How can I diagnose the issue?

2

The issue is either the sender (most likely), the gauge, or the wiring between them. Some vehicles have a separate sender for the gauge. The usual way to test the sender is to measure the resistance when the engine is cold and when the engine is hot. For 1 pin senders, measure between the output and ground. For 2 pin sensors, measure between the 2 pins.

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