How Often Should You Replace The Coolant?
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  • 1 Post By Submariner409
Cadillac DTS Forum - 2006 through 2012 Discussion, How Often Should You Replace The Coolant? in Past Cadillac Vehicle Discussion; I have 90k miles on my beautiful 2006 DTS and I'm thinking about having the coolant drained and new coolant ...
  1. #1
    tjwhite721's Avatar
    tjwhite721 is offline Cadillac Owners Fanatic
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    How Often Should You Replace The Coolant?

    I have 90k miles on my beautiful 2006 DTS and I'm thinking about having the coolant drained and new coolant added. Any recommendations?

    Some say its not necessary and some say it is necessary cause the coolant can get dirty over-time.

    Also, I know coolant flushes are bad, so that is why I'm just having the coolant drained.

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    Superjim's Avatar
    Superjim is online now Cadillac Owners Connoisseur
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    Re: How Often Should You Replace The Coolant?

    Quote Originally Posted by tjwhite721 View Post
    I have 90k miles on my beautiful 2006 DTS and I'm thinking about having the coolant drained and new coolant added. Any recommendations?

    Some say its not necessary and some say it is necessary cause the coolant can get dirty over-time.

    Also, I know coolant flushes are bad, so that is why I'm just having the coolant drained.
    If it has never been changed... you are way overdue... by about TWO YEARS... LOL
    The owners manual says to go NO LONGER than 5 years.
    The ADDITIVES get depleted over time and need to be replaced.

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    2 years, 3 max, regardless of coolant type. DO NOT add any stop leak products.

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    tjwhite721's Avatar
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    Re: How Often Should You Replace The Coolant?

    Quote Originally Posted by Superjim View Post
    If it has never been changed... you are way overdue... by about TWO YEARS... LOL
    The owners manual says to go NO LONGER than 5 years.
    The ADDITIVES get depleted over time and need to be replaced.
    Hi Superjim,

    I bought it used, so I'm not sure if it's ever been changed. I will set up an appointment Friday to have it changed lol. Do they need to replace any hoses or just drain and refill?

    Thanks!

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    Superjim's Avatar
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    Re: How Often Should You Replace The Coolant?

    Quote Originally Posted by tjwhite721 View Post
    Hi Superjim,

    I bought it used, so I'm not sure if it's ever been changed. I will set up an appointment Friday to have it changed lol. Do they need to replace any hoses or just drain and refill?

    Thanks!
    Check the hoses before you take it in.
    If a hose is getting hard and kinda brittle... change it.
    If a hose is getting soft and MUSHY... change it.
    If they look good and feel good... I don't see a pressing need to change them.
    BUT... if there is any doubt about one... change it.
    Lots better to change it now then be stranded on the side of the road later with a busted hose.

    Did you know that you can take your VIN to the local Cadillac Dealer and they can give you a printout of all the work that has been done to it at any GM dealership ??

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    jazoo is offline Cadillac Owners Fanatic
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    Re: How Often Should You Replace The Coolant?

    Quote Originally Posted by tjwhite721 View Post
    I have 90k miles on my beautiful 2006 DTS and I'm thinking about having the coolant drained and new coolant added. Any recommendations?

    Some say its not necessary and some say it is necessary cause the coolant can get dirty over-time.

    Also, I know coolant flushes are bad, so that is why I'm just having the coolant drained.
    According to the Owner's Manual, you should replace the coolant once every five years or 120,000 miles, whichever occurs first, with
    DEX-COOL® engine coolant. I do not know that when you acquired your Caddy. You may have to replace the hoses. The dealer can tell you about the condition of the hoses and the thermostat.

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    tjwhite721's Avatar
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    Quote Originally Posted by Superjim View Post

    Check the hoses before you take it in.
    If a hose is getting hard and kinda brittle... change it.
    If a hose is getting soft and MUSHY... change it.
    If they look good and feel good... I don't see a pressing need to change them.
    BUT... if there is any doubt about one... change it.
    Lots better to change it now then be stranded on the side of the road later with a busted hose.

    Did you know that you can take your VIN to the local Cadillac Dealer and they can give you a printout of all the work that has been done to it at any GM dealership ??
    HI Super Jim,

    Yes, I did that before I bought the car and the only work on it was a battery and admissions. It only shows warranty work.

    Thanks,

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    Quote Originally Posted by jazoo

    According to the Owner's Manual, you should replace the coolant once every five years or 120,000 miles, whichever occurs first, with
    DEX-COOL® engine coolant. I do not know that when you acquired your Caddy. You may have to replace the hoses. The dealer can tell you about the condition of the hoses and the thermostat.
    5 years is a lot to ask of coolant. Most members here will recommend 3 years max.

    And FWIW, you don't HAVE to use DEX, the all makes/all models stuff will perform exactly the same.

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    tjwhite721's Avatar
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    Re: How Often Should You Replace The Coolant?

    Any body up? Should i flush or drain it? I'm taking it to the dealer at 7:30am eastern time!

  11. #10
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    Submariner409 is offline If it won't run, chrome it
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    Re: How Often Should You Replace The Coolant?

    A bit late but ............ If you took the car in to a GM dealer and asked for a coolant change, they will use a pressure/vacuum machine to perform a complete coolant exchange using a 50/50 DEX-COOL/water mixture. You should not be able to tell they did anything. When the engine cools the coolant level should be at the proper level in the surge tank - half full. Note the "FULL COLD" legend and arrow molded into the top and side of the surge tank. Do not be surprised if they replace the pressure cap.
    Tom's Caddy likes this.

  12. #11
    tjwhite721's Avatar
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    Quote Originally Posted by Submariner409 View Post
    A bit late but ............ If you took the car in to a GM dealer and asked for a coolant change, they will use a pressure/vacuum machine to perform a complete coolant exchange using a 50/50 DEX-COOL/water mixture. You should not be able to tell they did anything. When the engine cools the coolant level should be at the proper level in the surge tank - half full. Note theh "FULL COLD" legend and arrow molded into the top and side of the surge tank. Do not be surprised if they replace the pressure cap.
    Hi Submarine,

    They just drained it and replaced with new Dex cool. The GM super tech said if it comes out not dirty, there's no need to flush. He checked my hoses and they were good. After he refilled it he washed my engine area with water and took it for ride to make sure he didn't smell coolant and etc. Brought it back in and made sure the level was accurate.

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