Cdti overheating

[SD1too]

Originally Posted by david2000

... drain the system and refill then with the engine running and the rad cap on wait for the engine to start to warm up then open the bleed screw ...

Hi Phil,

Here is the official MG Rover procedure for draining, refilling and bleeding your CDTi. Note that the bleeding process is completed before starting the engine and with the expansion tank cap removed.

To avoid problems with air locks I recommend that you follow it.

Simon

[MacRob]

Daft question, but did you have the temp set to max when filling the engine back up? If not it can cause an air blockage in the heater Matrix. If you don't have heat in the cabin then it will be fine but the moment you put the heating on the air trapped in the matrix will block the system up

[MacRob]

Originally Posted by SD1too

Hi Phil,

Here is the official MG Rover procedure for draining, refilling and bleeding your CDTi. Note that the bleeding process is completed before starting the engine and with the expansion tank cap removed.

To avoid problems with air locks I recommend that you follow it.

Simon

Interesting reading that. Does it mean that when you start filling the engine the aircon should be swtiched ON?

[SD1too]

Originally Posted by MacRob

... did you have the temp set to max when filling the engine back up? If not it can cause an air blockage in the heater Matrix.

I know what you're thinking Rob but the temperature controls won't affect coolant flow. All they do is drive air blending flaps. The heater matrix has full coolant flow at all times, irrespective of the position of any controls.

Simon

[trikey]

Originally Posted by MacRob

Daft question, but did you have the temp set to max when filling the engine back up? If not it can cause an air blockage in the heater Matrix. If you don't have heat in the cabin then it will be fine but the moment you put the heating on the air trapped in the matrix will block the system up

Doesn’t matter on our cars...

[SD1too]

Originally Posted by MacRob

Does it mean that when you start filling the engine the aircon should be swtiched ON?

No Rob. Whether the air conditioning is switched on or off makes no difference to the filling and bleeding process.

Instruction no. 7 specifies waiting for the radiator fan to start running as an indication of coolant temperature. This won't be possible if the air conditioning is operating as the fan will then be running continuously. That's why the heater/AC should be in 'Econ' mode.

Simon

[MacRob]

Originally Posted by SD1too

I know what you're thinking Rob but the temperature controls won't affect coolant flow. All they do is drive air blending flaps. The heater matrix has full coolant flow at all times, irrespective of the position of any controls.

Simon

what about on the classics that have analogue dials. Are they the same? Oh and out of interest, where is the engine drain plug?

[trikey]

Originally Posted by MacRob

what about on the classics that have analogue dials. Are they the same?

No, they still require the heater to be set to hot.


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[Mike Noc]

Originally Posted by SD1too

I know what you're thinking Rob but the temperature controls won't affect coolant flow. All they do is drive air blending flaps. The heater matrix has full coolant flow at all times, irrespective of the position of any controls.

Simon

Just in case there are any V8 owners looking in, the temperature controls do affect coolant flow.

[trikey]

Originally Posted by Mike Noc

Just in case there are any V8 owners looking in, the temperature controls do affect coolant flow.

This is very true, unless your original heater valve is stuck!!


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