VW PASSAT GOLF GLOW PLUG RELAYS
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22 October 2010
Before condenming the Glow Plug relay, check the temperature sensor, if this is not working correctly (or at all), it will usually cause the car to be difficult to start and it will usually be found that the glow plug circuit is not being given sufficient activation time (if at all).
Quickest and easiest way to test is to disconnect the connector (it is usually blue) to the temperature sensor, the glow plug circuit should now activate whether the engine is hot or cold.
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