I have a clean radiator, have replaced my thermostat assembly, can feel the fan pulling air past my fingers over the grill, I have replaced the coolant with Nulon, followed bleeding procedure in the owners manual. I have also checked that the water pump impellor is not damaged and that it turns when the engine runs.
The coolant tank was replaced under warranty, at 8 months age, because it became brittle and broke. My new tank now 7 month old has also changed so the coolant level is no longer visible through the tank. I believe my Defender has been heating since new but is gradually getting worse, now the hi temp warning is coming on after about 1 hour running, usually when running at idle while stopped to open gates after a period 50 to 70 kph running.
Question to anybody who has rebuilt one of these engines - Is there anywhere in the engine where a seal can swell cutting of coolant flow within the engine?
The coolant tank was replaced under warranty, at 8 months age, because it became brittle and broke. My new tank now 7 month old has also changed so the coolant level is no longer visible through the tank. I believe my Defender has been heating since new but is gradually getting worse, now the hi temp warning is coming on after about 1 hour running, usually when running at idle while stopped to open gates after a period 50 to 70 kph running.
Question to anybody who has rebuilt one of these engines - Is there anywhere in the engine where a seal can swell cutting of coolant flow within the engine?

