Bad ECM or something else?

djkaosone said:

Overheating, sounds like you may have air pockets in your cooling system. These trucks are extremely difficult to get all the air out of the block. The internal cooling system is mechanical with rotating water pump and usually there's not enough coolant to circulate, and overheats. The thermostat is a mechanical thermal valve spring in a plastic housing with a temp sensor at/near the inlet pipe.

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f1racer328 said:

The thermostat is electronically controlled though, it isn't purely mechanical.

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djkaosone said:

Not sure what you mean about "electric auxiliary coolant pump"

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powershift said:

Take it to a different mechanic.

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jlglr4 said:

To my understanding, the electronic thermostat is still primarily a thermomechanical mechanism that, in addition, has a heated wax element that the ECM can use to open the thermostat a bit faster when desired. But, the thermostat will still fully open in response to rising coolant temp and a malfunction in the ECM should not cause overheating.

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jlglr4 said:

I don't have any clue about the OBD. I'm not familiar with the Autel systems. Have you had it working with this car before? Have you tried a different scanner (even just a cheap one) to see if you can get any reading - rule out a problem with the scanner itself?

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Alain said:

I agree with your statement, but then why does the t-stat have an electric heat element? I will troubleshoot further. I vacuum filled the coolant, but still have air pockets in the front cross over pipe.

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Alain said:

On Guam we have limited mechanics familiar with European cars. I have taken the LR4 to two different mechanics. One said it is an engine internal issue. The other mechanic shop has no idea. I don't trust the Land rover dealership.

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