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Discussion Starter #1
So i had a coolant leak at my lower radiator hose on my 2008 hse with 149k miles on it. My mechanic ordered two different lower radiataor hoses, and one of them states the correct part # on the package (pch501740, but unfortunately he says neither fit. One of them says [email protected] on the packaging.

I just ordered another lower radiator hose from land rover merriam. part pch501740.

any thoughts on why the part doesn't fit?

thank you
 

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2010 SC 5.0 Range Rover MkIII / L322
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1,996 Posts
only way your gonna a reliable answer is to post pictures of your radiator and the hoses
 

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Discussion Starter #6
Maximus thank you for offering your help.

pch501310 is the hose thermostat to radiator? Isnt that a different hose?

thank you
 

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2006-2009 Range Rover MkIII / L322
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25 Posts
It's the only hose that matches what's in your photo of the hose the mechanic is looking for.
 

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Discussion Starter #9
2008 Range Rover HSE 155k
haven't changed radiator, water pump...
did replace belts and the lower radiator hose to thermostat 3 months ago.... as ihad a leak.

So after a few months it appears that i have another coolant leak... this time it appears to be from the other lower radiator hose..
the check coolant light comes on after 30 minutes of highway driving at 30-50 mph.... ive topped it off a few times, but even with the reservoir not showing low, the check coolant light comes on.....
i brought car to my mechanic who took a look and thinks it is from the other lower radiator hose... he topped off the coolant and im going to bring it back... he said that there are no evidence of leaks from the top of the engine...

he removed the cover to the bottom front of the car and so i parked the vehicle in my driveway and placed a carboard on the bottom and very little coolant appears on the box,,, just a drop or two the size of a nickle… there is some coolant on the frame/hoses from below, which i need to take a better look,, or at least have the mechanic look again....

a few questions
1) i haven't changed the thermostat or water pump in this vehicle 2008 HSE with 155k miles.... should i just change these as part of preventive maintenance.. not sure if changing the other lower radiator hose implies lots of work that i might as well change these as well
2) since i continue to get intermittent check coolant level, even with reservoir tank not showing low, anything else to do?change? Coolant sensor?
i have the iland device, when i scan, i don't get any codes.... what should the coolant temp read? any specific things to check to help me diagnose any other coolant problem?

rover runs great, no issues..... as it appears to not be a gasket, valve issue, id like to fix this and change out any other parts in prevention, so i don't have to keep going back every few months for another hose/part that needs to be swapped out.
thanks again for your feedback and help... this site is really amazing...
 

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Discussion Starter #10
so i eventually replaced the radiator, the lower radiator hose and the hose thermostat to radiator and it has been a year with no problem.. however i have had a problem with lean codes since then and ive asked in othe rforums about those and i think ive gotten closer to a diagnosis.. and at least not throwing parts at the problem...

however i now have the following codes pop up..

p0128-0 coolant thermostat (cooling temperature below thermostat regulating temperature Pending

and then a few hous later, p0116-2 engine coolant temperature- circuit range/performance... (Historic)

i have a 2008 Range Rover HSE with 169k miles on it.. i have not changed the thermostat... is that what i should do? or how can i diagnose the thermostat as the cause of these codes? any other hose to replace while im there?

i also have a p0171 system too lean bank 1 intermittent.....and ive done a thorough diagnosis and my next step is to replace fuel filter (hasnt replaced it) i had p0171 and -0174 over the last few months........

i thought id add to this thread...... instead of starting a new one...

thank you again for your feedback and advice... much appreciated
 

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L322 - 2005, 2006 na, 2012 sc
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254 Posts
Do you have an ODBII reader that will show you the coolant temp? Wondering if the sensor is way out of bounds or not. Throwing parts at it wise, a thermostat and o-ring are cheap. super easy to replace and likely due to be refreshed.
 

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Discussion Starter #12
Yes I do....15 min into the drive the temp was 100 and went up to 168f after. a. 40 miin drive.

what does this mean? Sensor is working?
 

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L322 - 2005, 2006 na, 2012 sc
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Looks like the sensor is at least delivering data that seems to change with temperature. No idea if it's correct or not. The temps are low. I don't know if anyone has any further suggestions for troubleshooting but I would go ahead with a new thermostat and o-ring to see if that resolves it. They are very cheap from dealer, I think less than $50 total for both. Time to install is negligible as well. It's 3x10mm bolts that are easily accessible when the air filter on drivers side is removed. The longest part will be draining the coolant and bleeding the system afterward. Putting the new thermostat into the flange can be a PITA. You have to push the thermostat in while twisting.
 

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Discussion Starter #14
ok great . i ordered the thermostat... to add to this.. i drove for 40 minutes anywhere from 10-50mph 9some highway driving) and the final readings for temps are:
engine coolant temp 179.6 F
engine oil temp 179.6
tranmission oil temp 186.8
i then checked my upper radiator hose and it is hot.
 
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