Discussion
Start up from cold and put your hand on the top hose or the top of the radiator.
If the temperature gradually increases over a while with the engine idling - 5 or 10 mins should be long enough - rather than staying cold and then suddenly getting pretty hot, then it's likley the thermostat has failed in the open position.
If the temperature gradually increases over a while with the engine idling - 5 or 10 mins should be long enough - rather than staying cold and then suddenly getting pretty hot, then it's likley the thermostat has failed in the open position.
If I remember the X300 has an electric pump to circulate coolant through the heater matrix.
Next step would be find it - I think it's toward the rear of the engine compartment inline one of the hoses - and to check it's running when the engine is and the climate control is calling for heat.
Next step would be find it - I think it's toward the rear of the engine compartment inline one of the hoses - and to check it's running when the engine is and the climate control is calling for heat.
X300's Did have a pump, and an electronic valve controlling the heater flow, a simple multi-meter test will show you whether these are working or not. Another problem is the matrix core it's becoming clocked with debris from the cooling system, have changed a few of these for that problem. Let us know how you get on.
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