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Old 02-29-2012, 07:48 AM   #1 (permalink)
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Default Replacing Thermostat Housing

Hi Guys,
after changing the thermostat a couple of weeks ago I am now noticing that the thermostat housing is leaking a bit. I am planning to replace the housing but I am wondering if it is mandatory to drain the coolant as I did it before? or it is not mandatory.. I just want to skip this step if not needed. I do not want to get a mess of coolant fluid when I remove the 3 hoses from the thermostat housing.

Thanks in advance, Roberto

Last edited by rzuluaga; 02-29-2012 at 01:26 PM.
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Old 02-29-2012, 08:12 AM   #2 (permalink)
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V6 or V8?
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Old 02-29-2012, 08:14 AM   #3 (permalink)
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I have an 05 LR3 HSE V8. 80k miles.
Thanks
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Old 02-29-2012, 08:29 AM   #4 (permalink)
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At least drain it below the level of the housing to make the mess smaller.
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Old 02-29-2012, 12:53 PM   #5 (permalink)
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Depending on where the housing is leaking you might not have to replace the whole housing. There are several rubber seals in the various ends of the housing that may be your problem and can be bought seperately, or at least the one that seals where the uppper and lower housing join can be I know for sure. You dont have to drain the coolant when you do this and you really didn't when you did the thermostat either. It is just a good idea to change the coolant every once and awhile and you might as well when you are changing the thermostat. If you are ideed changing the housing you will have to buy everything together for around $100 unfortunately. I just had to do this same thing. You will end up getting the upper and lower housing with all the seals along with a new coolant temperature sensor and thermostat. Let me know if you just need just the lower portion of the housing and seals as I have that and both a thermostat and coolant temp sensor left over from when I did this.
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Old 02-29-2012, 01:37 PM   #6 (permalink)
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Quote:
Originally Posted by wrxracer87 View Post
Depending on where the housing is leaking you might not have to replace the whole housing. There are several rubber seals in the various ends of the housing that may be your problem and can be bought seperately, or at least the one that seals where the uppper and lower housing join can be I know for sure. You dont have to drain the coolant when you do this and you really didn't when you did the thermostat either. It is just a good idea to change the coolant every once and awhile and you might as well when you are changing the thermostat. If you are ideed changing the housing you will have to buy everything together for around $100 unfortunately. I just had to do this same thing. You will end up getting the upper and lower housing with all the seals along with a new coolant temperature sensor and thermostat. Let me know if you just need just the lower portion of the housing and seals as I have that and both a thermostat and coolant temp sensor left over from when I did this.
Check this photo .. my guess is that it is leaking from the upper housing and from a bolt. Also the same day I changed the thermostat (2 weeks ago) I also replaced the housing gasket o-ring that fits in the lower part of the housing.

https://plus.google.com/u/0/photos/1...73942039248514

I took that picture with a blue light flashlight to get a better contrast with the orange coolant fluid.

Do you think that is the upper housing too? If so I will be buying this one.

Land Range Rover Sport LR3 Genuine OEM Thermostat Housing Cover


Last question. Do I need to disconnect the battery when replacing the housing?

Thanks
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Old 03-01-2012, 05:09 AM   #7 (permalink)
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My guess would be that it is just your upper housing that is leaking. Mine looked like the coolant was coming from around one of the bolts as well even though I couldn't visually find a crack. I replaced just the upper housing, and no more coolant leak. I wish I had known you could just buy the upper housing when I did this job. The battery wont need to be disconnected.
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