Question about 2002 Land Rover Discovery Series II

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Over heating Truck runs fine for about 20minutes then sometimes it over heats and then shuts off then sometimes it will run fine. I've changed the radiator,all hoses and it still is over heating and some time it doesn't. Head gasket test was fine I'm at a loss please help me.....

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Hi. I assume that you already checked the thermostat valve. I believe that you have a beginning of head gasket problem or a small crack somewhere. The best test for head gasket, even being a time consuming test, is to remove all spark plugs, fill up the radiator, put one cylinder at top dead center, which means the cylinder is in explosion position, install a cylinder leak test hose attachment (from a cylinder leak tester that you can purchase a Harbor Freights) and connect a compressor hose. Observe if air bubbles comes from the radiator. Sometimes it takes longer to show up so be patience. I've had an Honda Civic that was taking over 5 minutes to shows bubbles. If it does, your head gasket is beginning to get bad. Good luck.

Posted on Dec 31, 2013

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Posted on Jan 02, 2017

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SOURCE: just replaced head gaskets vehicle overheating top

clogged rad. try removing thermastat.. it might be sized,

Posted on Nov 29, 2009

  • 1 Answer

SOURCE: rover 45 over heating radiator stays cold and when

my rover 45 wont start it makes a screaching noise when i turn the key . but wont fire up

Posted on Dec 01, 2009

  • 2841 Answers

SOURCE: Ive changed out my water pump as well as my fan

You need to make sure there is no air trapped in the system. I assume you flushed the radiator when you changed the thermostat. I also assume you installed fresh coolant mixed 50/50 antifreeze and distilled water. I also assume you installed the thermostat correctly with the spring facing the engine. Look on the upper part of the cooling system and the engine for bleeder valves (If Equipped). Now remove the radiator cap from a cold engine and make sure the radiator is totally full. Set the heater temperature control to HOT. Start the engine and look for escaping air bubbles from the radiator. Keep the coolant level full at all times. It will take awhile for the thermostat to fully open so be patient. Once you see no more escaping air bubbles install the cap. Wait about 2 minutes with the engine running and use the bleeder valves to remove any more trapped air from the system. Post back if this did not help.

Posted on Dec 14, 2009

  • 8 Answers

SOURCE: Engine is losing antifreeze. New radiator,

If it is not leaking try taking the top off the reservoir, crank it and let it warm up, if no coolent rises into the reservoir when it is warm, add some coolant until it just starts to fill the res...it might go down some then and more till it rises. if it does not rise or fall. Turn it off, let it cool the fill to the mark. If this aint it then it might be leaking....check the heater hoses and inside the care for coolant. might be the heater.

Posted on Mar 27, 2011

  • 560 Answers

SOURCE: Overheating

ckeck thefan clutch if you can spin it easy by hand eng. off! make sure the air is bled out of the cooling system if the fan is easy to turn its junk

Posted on Jun 11, 2012

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