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problem of water pump or thermostat?

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Old 01-05-2010, 08:16 PM
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Default problem of water pump or thermostat?

I got inspection for my jag yesterday and mechanic said that Upper and lower hose had different temperature which was upper very hot, lower not. and then he said I had to replace the water pump which is worth 300$$$ and labor fee could be 300$!!! hm...

But I am not sure if water pump is wrong or not cause every my friends say it could be problem of thermostat which controls temperature and is barely 10$$ lol.

so if there is somebody who has had same experience before, plz let me know
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Old 01-05-2010, 08:26 PM
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I had a water pump installed in my 2003 3.0 and the cost parts and labor was $300. This was done at an independent shop. You did not say what the symptoms were, but if you need a new water pump, would suggest also replacing the upper hose assembly (Jaguar part-$190), as this has a number of parts, and during the water pump installation, this hose assembly will have to manipulated to get it out.
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Old 01-05-2010, 10:07 PM
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i did my thermostat myself, was 15 dollars. I have a STR though and the location of it was right there in front of my face looking into the engine bay.. I took it to a local shop and was quoted about 500 parts and labor....i kindly said no to that number.
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Old 01-05-2010, 10:11 PM
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kblood, I would be venturing to guess that it is a thermostat problem, not a water pump problem. I say this based on the fact that if your water pump was failing, you would be having issues with the car at highway speeds. The motor would not be getting enough cooling going through the engine to keep it in a safe condition. Then you would get the check engine light, "failsafe engaged", etc. So, spend the $10 on a new thermostat and pick up a gallon of 50/50 antifreeze (make sure it is the same as what is in the car at the moment, you can't mix colors of coolant). Granted, if your hoses are fairly old, this may be a good time to do the hoses too. In that case, you will need 3 gallons of 50/50 coolant (or 2 gallons of the concentrate and then you add up to 2 gallons of distilled water to fill the rest of the system).

ify ou need more info, let me know.
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Old 01-05-2010, 11:32 PM
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Oh, AS soon as I saw your reply, I canceled my order of water pump lol..
so far, my car was good driving on high way. Actually I am living in mn which means right now it is fairly really coooold and ave temperature is around -10f so this weather colud be able to cool engine or not I think... Tomorrow I will go autozone to buy thermostat and check my car to individual mechanic who is sort of my friend lol..
But honestly my jag is 03 74000mile car so,, water pump may need to change, but before doing it, I would try cheaper one first and one by one hah thx a lot!
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Old 03-02-2010, 09:54 PM
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Exclamation S-Type R thermostat replacement

As an automotive engineer and enthusiast, I get frustrated with the cryptology required to search for basic auto maintenance information these days. I can understand having to pay for factory online manuals for an engine overhaul. But basic information on servicing wear items like brakes, hoses, and thermostats should be more readily available and easily accessed.

But I guess that's why we have sites like this one!

I just wanted to post a couple of photos showing the location of the thermostat in an S-Type R. I replaced the sticking thermostat last month on my car with 33k miles on it. Hopefully future newbies will find this right away if they choose to tackle the job on their own. This simple job will help you avoid the associated overheating problems and leaks from a cracked coolant reservoir that results from a stuck thermostat, as well as a hefty bill from your mechanic.

http://i895.photobucket.com/albums/a...atlocation.jpg
http://i895.photobucket.com/albums/a...tathousing.jpg
http://i895.photobucket.com/albums/a...thermostat.jpg

Obviously, the cooling system must be properly drained, refilled, and de-gassed during the repair to avoid damage. A pressure test may be necessary if you did experience leaks before replacing the t-stat. I hope this helps, and sorry if someone else has already posted something similar.

Cheers!
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Old 03-03-2010, 03:14 AM
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Excellent pics - thanks! If you don't mind maybe you could provide a bit of detail about what steps you followed, such as :

I can see you've removed the engine top cover and the air intake trunking from just after the MAF. Did you take anything else off?

Did you need any special tools?

Did you drain the coolant from the radiator bottom or some other location?

After refilling with coolant, what steps did you take to bleed air out?
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Old 03-03-2010, 10:20 AM
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Changing my thermostat this weekend.....

from when i did mine last year
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Old 03-03-2010, 10:34 AM
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Thanks.
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Old 11-17-2010, 03:39 PM
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I know this is an old thread, but just in case someone is looking for information and finds this.

The Mechanic in this case is a thief. If the upper hose is hotter than then the lower hose that means the radiator is doing it's job. Cooling the coolant. No need for water pump or thermostat.

$300 for labor $300 for parts. I changed mine start to finish in an hour and half. That included a trip to Autozone for an $89 water pump.
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Old 08-13-2016, 07:23 AM
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How did were you able to change your water pump. Would you, please, give some more info? Thanks!
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Old 08-13-2016, 07:42 PM
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Quote:
Originally Posted by phb View Post
How did were you able to change your water pump. Would you, please, give some more info? Thanks!
Refer to JTIS, which can be downloaded free from this forum, or obtain the Workshop Manual from an Internet vendor.

Is the vehicle in question a 3.0 Litre or 4.2 Litre? What is the number of kilometres/miles? Has the cooling system been pressure tested and inspected for leaks?
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Old 08-15-2016, 11:29 AM
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It is a 6-cylinder, 3.0, S Type, about 77k miles. I changed the thermostat and bled the air out. The light is still on and it still overheats just by letting it go idle or driving a couple miles. I will have someone better skilled at this look at it. Thank you for the guidance.
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Old 08-15-2016, 11:58 AM
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Did you replace the thermostat with a Jaguar part (XR85174)? I have found the aftermarket or generic ones do not work correctly.
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Old 08-15-2016, 12:13 PM
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Is this one that can be installed backwards?
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Old 08-15-2016, 12:18 PM
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No, the housing does not permit the thermostat to be installed incorrectly, unless an aftermarket or generic one has a different profile.

The side of the thermostat containing the spring MUST be facing upwards towards the radiator upper hose connection.
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