If the codes do not return, it is assumed that they are intermittent and that the glow plug heater circuit is in working order. If the P0380 code returns, the mechanic should inspect the wires, connectors, and fuses around the glow plug heater circuit. Any loose or open wires, corroded or damaged connectors, or blown fuses should be replaced. Here are the most common reasons why your car heater isn't blowing hot air. Low coolant: Whether caused by a leak or water evaporation, low coolant is the most common source of poor heater output. Thermostat: A stuck-open thermostat prevents the engine (and coolant) from heating up. Heater core: A clogged heater core restricts coolant flow If its an Astra H everything is controlled by Software and Modules. These are prone to getting glitches in them which causes all sorts of weird faults. If it is an Astra H try disconnecting the Battery Negative Lead overnight or for at least 6 hours and no less. If it is a Software or Module glitch then doing this will reset everything.
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The glow plug control module determines the timing and electric current required by the glow plugs based on input from the Engine Control Unit; The heating element in the glow plug is electrified so it heats up and emits visible light (hence the name); Intake air is compressed; The fuel injector spray directs fuel onto the hot tip of the glow plug;

Consider to support my channel and all the hard work put into it at youHiThis car came to me with a few issues M

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    • opel astra heater not working