2008 DTS overheating. Requesting your thoughts.
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Cadillac DTS Forum - 2006 through 2012 Discussion, 2008 DTS overheating. Requesting your thoughts. in Past Cadillac Vehicle Discussion; My 2008 Cadillac dts is overheating after about 15 minutes of it running. When I turn on the heat at ...
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    faith1957 is offline Cadillac Owners Member
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    2008 DTS overheating. Requesting your thoughts.

    My 2008 Cadillac dts is overheating after about 15 minutes of it running. When I turn on the heat at full blast it goes almost back to the halfway mark. I took it to my shop and they changed the thermostat. It still continues to overheat. My shop told me 1 hose to the radiator is hot and the other is cold so now they're telling me it's the water pump. Which is 1100 dollars to fix. Don't know what to do

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 2008 DTS overheating. Requesting your thoughts.

    It was probably not the thermostat - they're very reliable. $12 at any NAPA. Water pump drive belt ???? On the driver's end of the engine, left bank intake cam extension. Also, do some Google searching for "cadillac forums northstar coolant purge line".

    If it IS the water pump, they're a long, involved mess to get to in the "DTS" vehicle series - after 2005 the cooling system underwent significant hardware changes in the Northstar engines. The water pump itself is probably only about $55 - but the required labor time is simply staggering.

    Online parts pricing in www.rockauto.com

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  4. #3
    crazcaddyguy's Avatar
    crazcaddyguy is offline Cadillac Owners Fanatic
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    If the water pump and pulley and belt are good.... change your water tank pressure cap!

  5. #4
    stormnn's Avatar
    stormnn is offline Cadillac Owners Fanatic
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    Re: 2008 DTS overheating. Requesting your thoughts.

    GM calls for 6 hrs to do a pump but a good mech. can do it in 4. Cost me about $450 a year ago here in Leesburg including gaskets, belt & pullies.
    Norm.

  6. #5
    crazcaddyguy's Avatar
    crazcaddyguy is offline Cadillac Owners Fanatic
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    I say try the pressure cap first. I changed the water pump in 06 dts it took me a good whole day... With that said after I had done that it was still over heating and I changed the pressure cap and it cured my issue. ...

  7. #6
    DTS Mafia is offline Cadillac Owners Member
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    Re: 2008 DTS overheating. Requesting your thoughts.

    If the shop replaced the thermostat correctly, your'e looking at a bad water pump.

  8. #7
    crazcaddyguy's Avatar
    crazcaddyguy is offline Cadillac Owners Fanatic
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    Start with the cheapest and easiest try the cap! Trust me.

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    Black Beauty DTS's Avatar
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    Re: 2008 DTS overheating. Requesting your thoughts.

    Quote Originally Posted by faith1957 View Post
    My 2008 Cadillac dts is overheating after about 15 minutes of it running. When I turn on the heat at full blast it goes almost back to the halfway mark. I took it to my shop and they changed the thermostat. It still continues to overheat. My shop told me 1 hose to the radiator is hot and the other is cold so now they're telling me it's the water pump. Which is 1100 dollars to fix. Don't know what to do
    First of all, welcome to Cadillac Forums.

    Did you check to make sure that the coolant level is at the full mark when the engine is cold? If not, check to make sure that it is full before the car is started for the day, since the engine has to be cold. If you need to add coolant, make sure that it is a 50/50 (50%) Dexcool to water ratio.

    Also, you might want to check your cap. If you have a garden hose with a pressure nozzle at the end, use that to shoot the spring that is located right under the top of the cap. There may be some crud that is lodged in the spring that prevents it from functioning properly. If that doesn't help, then like others have mentioned already, your cap may need to be changed.

    As for water pumps, it is a very basic mechanical device that simply has an impeller that is turned by a pulley. Therefore, there is nothing that normally goes wrong with them, other than the seals leaking. If the pump is leaking, then yes it will need to be changed and would cause the coolant level to drop, requiring you to add coolant. If it's not leaking, then that is most likely not the problem.

  10. #9
    Superjim's Avatar
    Superjim is offline Cadillac Owners Connoisseur
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    Re: 2008 DTS overheating. Requesting your thoughts.

    If the water pump IS NOT LEAKING... it is very doubtful that it needs replacing.
    Have the coolant checked with a hydrometer to make sure it is a 50/50 mixture or very close to 50/50.

    Replace the pressure cap... the cooling system will not function properly if the cap is not holding the correct pressure.

    http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1

  11. #10
    crazcaddyguy's Avatar
    crazcaddyguy is offline Cadillac Owners Fanatic
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    What Jim said^ told ya.

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