Tantus Pedis wrote,...
Sometimes the heater matrix which by design has rather fine cores becomes partially or completely blocked, and so the coolant within tends to stay fairly well put. As a consequence the heater does not function any where near as well as it should do. Detaching each of the heater hoses and directing a jet of water via a hose into one of the heater matrix pipes will usually help to clear any blockages that may be present within.
It is also possible that the metal flaps within the heater box may have lost most if not all of their foam insulation, which will reduce their operational effectiveness.
With the thermostats, an 82 degree model will usually be the right choice for the P6B within the U.K, while it is my understanding that the thermostat in the fuel injected SD1 was an 88 degree issue. This was largely a requirement of the engine managed fuel injection system.
Ron.
Heater has started misbehaving again - starting to blow cold halfway through a run with a small dip in engine temp on the gauge.
Sometimes the heater matrix which by design has rather fine cores becomes partially or completely blocked, and so the coolant within tends to stay fairly well put. As a consequence the heater does not function any where near as well as it should do. Detaching each of the heater hoses and directing a jet of water via a hose into one of the heater matrix pipes will usually help to clear any blockages that may be present within.
It is also possible that the metal flaps within the heater box may have lost most if not all of their foam insulation, which will reduce their operational effectiveness.
With the thermostats, an 82 degree model will usually be the right choice for the P6B within the U.K, while it is my understanding that the thermostat in the fuel injected SD1 was an 88 degree issue. This was largely a requirement of the engine managed fuel injection system.
Ron.