s11a heater round type

[kingdong]

Hi all

now winter is just around the corner i was woundering will the 200 tdi engine make the heater any better as the heater with the petrol engine in was carp.

graham.

[David Sparkes]

Only if the flow around the heater is always on, that is, there is no on/off tap in the heater circuit, AND there is no thermostat bypass circuit in the engine itself. No bypass circuit in the engine means the coolant HAS to go through the heater matrix before the thermostat opens. In very cold weather, with the heater fan on, the heat loss through the matrix is all the engine needs to keep cool.

If the engine has it's own bypass circuit you have no chance of improved performance. A diesel puts less heat into the coolant than a petrol engine. In the extreme of the TD5 engined Discos this is why a fuel burning heater is an option, essential in colder climates, as there simply isn't enough heat from the engine to keep the car warm.

I'd say all modern engines use full flow heaters, with no engine based thermostat bypass circuit. This gives the best heater performance available, and rapid engine warmup. The latter helps meet drive-by noise regulations, emission regulations, and fuel economy targets.

Heater output is regulated by blending heated and unheated (or air conditioned) air.

I suspect your heater matrix is internally clogged with carp, dropped out of the coolant due to the low flow rate.

I can't just think of a good way of mechanically cleaning the inside of a curved tube heater matrix, so I'd start looking for Serck(?), or some other radiator specialist, and buy a new one.

Sorry.