2008 LR3 overheating -coolant not circulating

Discussion in 'LR3' started by Matt-LR3, Oct 12, 2018.

  1. Matt-LR3

    Matt-LR3 Member

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    2008 LR3 185,000 miles
    Coolant not circulating causing engine to overheat. I replaced the water pump (looked fine), replaced thermostat (which was shot) but did not fix problem. The heat is not working so I’m guessing a clogged line to the heating core? Any suggestions?
    There is now some steam coming from throttle body and the coolant bubbles back into the reservoir once I shut it down and open the bleeder.
     
  2. Geoff Kirkpatrick

    Geoff Kirkpatrick New Member

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    Hello Matt, i recently replace the coolant system on my 06 RRS. when i got it all back together it would over heat and no interior heat. took it all back apart and reinstalled and still no heat. after squeezing the heater core inlet pipes and adding pressure to the system did everything begin to work normal. the fluid used in these rigs seems to coagulate in the system causing temporary blockage.
    have faith in your machine and be patient is what i've learned, good luck.
     
  3. Matt-LR3

    Matt-LR3 Member

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    Thanks, I’m attempting to flush the system this weekend, I figure it has to be a blockage in a line or the radiator. I’ve replsced a couple lines that were in poor condition already, but still searching. I’m confident I will figure it out. This is my 2nd LR3 and we bought a 2011 sport last year. As they say I’d rather be pushing my Rover than driving your Jeep!
     
  4. Matt-LR3

    Matt-LR3 Member

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    So looks like it was a clogged heater core. I flushed the radiator and it seemed to flow fine so I flushed the heater core and out came pieces of the old thermostat!! After filling up the system and bleeding the air out it seems to be running well!!

    I knew the heat wasn’t working but I didn’t think it would cause the entire cooling system to fail...
     
  5. rfh1987

    rfh1987 Active Member

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    How did you manage to do that? I was off roading with some friends, when I got a leak in my coolant system. One of the friends was a mechanic, but after repairing the leak, he couldn't get the air out of the system. When I brought it to Land Rover, I asked them, "If this had happened to you, would you be able to get the air out?" He said no. He had to use some special tool at the shop to get the air out. It was a 2006 LR3.
     
  6. macbright

    macbright New Member

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    I apologize I did not mention when I did it myself... It still had the problem. That is the reason I had to take it to a LR Mechanic to recalibrate the computer for the new module with sensor then it worked properly.

    I daily drive a 2005 LR3. ALSO have a 2004 Range Rover (a "Cream Puff"). My Coolant System Failure was caused by the Thermostat / Sensor / Housing component. Have a "LAND ROVER QUALIFIED MECHANIC" check this! It requires the unit replacement if this proves to be the problem. Just like you Grand Pappy's Ford Pickup Truck in the 1950's... it gets stuck closed and wham it overheats! Good luck with you search for answer this on is simple. Happy Rovering...PEACE OUT!
     
    Last edited: Oct 27, 2018
  7. Sagin

    Sagin Member

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    I HAVE THE SAME PROBLEM. Or at least it reads like it. I noticed steam coming from the engine compartment after leaving the carwash. I thought it was a brilliant idea to race my rig home to drain the excess water off and then detail dry LOL. That said white steam was coming out near the rear of the throttle body.

    Replaced

    thermostat, coolant pump, coolant hoses, serpentine belt (why not), belt tensioner (another why not), oil cooler tube, oil cooler tube seals (one on each side)

    Filled with factory recommended coolant and turned the heater on to fill. The engine runs on idle for at least 10 minutes without showing signs of overheating, then - whamo! It starts with the white steam coming out of the rear of the throttle body area.

    Any thoughts group? Oh and glad that Matt got his problem solved! I am dealing with a mystery my friends.


    2010 HSE non SCH
    Los Angeles, CA
     
  8. afour_98

    afour_98 Member

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    You could have a leak in the throttle body. Have you tried pressure testing the system cold?
     
  9. Matt-LR3

    Matt-LR3 Member

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    I actually had to flush it a second time because it stopped working again either because it was still partially clogged or there was air trapped. Every time the engine started overheating, the heat was not working. I made sure to fill the heater coil and hoses as much as possible before reconnecting then rev the engine to 3500 RPMs to get the coolant to flow. I bled off the air from the reservoir plug and topped it off a few times. I also found a small piece of the old thermostat gasket in the small hole of the thermostat housing. Been running well for a week now.
     
  10. Matt-LR3

    Matt-LR3 Member

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    I had a small hole in both the coolant hoses coming out below the throttle body. Replace one hose and cut the bad end off the other.

    2942924F-2F47-4586-9535-CBBBD448352D.jpeg
     

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