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  1. #1
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    CVT transmission FLUSH attempt

    So this weekend if I have time I am going to attempt to flush the fluid and change all of the filters (pan and cartridge). I have all of the parts I need. Still haven't got under the hood and figured out how I am going to do it.

    My goal is to mimic a flush machine. I think I'm going to remove the transmission lines going to and coming from the cooler, run the car and let the line coming from the trans drain into a pan and use the line going from the cooler to the trans to refill the trans while this is happening. Not sure how I'm going to do that. Maybe just using a funnel attached to the line and filling as the car runs.

    What's your guys thoughts?






  2. #2
    [QUOTE=flotownj;70568]So this weekend if I have time I am going to attempt to flush the fluid and change all of the filters (pan and cartridge). I have all of the parts I need. Still haven't got under the hood and figured out how I am going to do it.

    My goal is to mimic a flush machine. I think I'm going to remove the transmission lines going to and coming from the cooler, run the car and let the line coming from the trans drain into a pan and use the line going from the cooler to the trans to refill the trans while this is happening. Not sure how I'm going to do that. Maybe just using a funnel attached to the line and filling as the car runs.

    What's your guys thoughts?
    How do you plan to flush the actual passages? You do know that the lines that come off the cvt cooler are filled with coolant not cvt fluid. When you remove the cooler the passages for the fluid aren't threaded so you'd either have to fab up your own plate with some type of fitting or try to stuff a hose in there and not expect it to hold up very well.

    I personally wouldn't bother. I'd just change the fluid and filters. All the bolts have 10mm heads so that makes it simple.

    Maybe around 125000-150000miles pull the cvt out, split the case and replace the thrust washer on the input shaft as preventative maintenance.
    Mirage videos:

        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)


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    WOW! That sucks.

    I totally assumed that the car had a transmission oil cooler. With transmission fluid going through it and I was planning on tapping into the lines. Man I am so disappointed right now. Guess if that's true I will just be doing a drain fill and filter replacement.

  4. #4
    How many miles are on your car?
    Mirage videos:

        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)


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    Quote Originally Posted by flotownj View Post
    Man I am so disappointed right now.
    Why? Sounds like the job just got simplified.

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 49.6 mpg (US) ... 21.1 km/L ... 4.7 L/100 km ... 59.5 mpg (Imp)


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    Quote Originally Posted by flotownj View Post
    WOW! That sucks.

    I totally assumed that the car had a transmission oil cooler. With transmission fluid going through it and I was planning on tapping into the lines. Man I am so disappointed right now. Guess if that's true I will just be doing a drain fill and filter replacement.
    Transmission oil does run through the cooler it’s that instead of moving air through the cooler it’s cooled by engine coolant in a stack type cooler. I would think the stack cooler would keep the CVT temps at a more stable temperature (especially at low speeds) since coolant is always pumping through it.

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 automatic: 40.5 mpg (US) ... 17.2 km/L ... 5.8 L/100 km ... 48.6 mpg (Imp)


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    Are you sure?

    Quote Originally Posted by flotownj View Post
    WOW! That sucks.

    I totally assumed that the car had a transmission oil cooler. With transmission fluid going through it and I was planning on tapping into the lines. Man I am so disappointed right now. Guess if that's true I will just be doing a drain fill and filter replacement.
    Are you sure the cooler is not running transmission through the lower section of the radiator. I have a Mazda 5 that has a similar cooler on the transmission and it pumps transmission fluid, not engine coolant, through the bottom section of the radiator. I found a video for the Mazda 5 where you remove the one hose that pumps the transmission fluid Into the radiator and then you add a hose to the cooler outlet and run it into a bucket to measure how much fluid you are pumping out. You alternate running the car for 15 seconds, turning it off, then adding more new transmission fluid through the dipstick opening. I completely replaced my transmission fluid on my Mazda that way. My bucket had quart markings on it, so I knew how much fluid I was pumping out to know how many quarts to put back in. Once I got slightly past the rated fluid capacity of the transmission, the fluid coming out of the cooler turned from a brownish color to the red color of new coolant, so I knew that I had replaced all of the old fluid with new at that point. The process was easy. Btw, the service manual for the Mirage refers to that cooler at the transmission as a “transmission fluid cooler“, NOT as a “transmission cooler” or a “transmission coolant cooler”. Can anyone re -confirm that it is actually engine coolant running through that cooler and not transmission fluid?

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    Moderator inuvik's Avatar
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    Quote Originally Posted by Gerbur View Post
    Are you sure the cooler is not running transmission through the lower section of the radiator. I have a Mazda 5 that has a similar cooler on the transmission and it pumps transmission fluid, not engine coolant, through the bottom section of the radiator. I found a video for the Mazda 5 where you remove the one hose that pumps the transmission fluid Into the radiator and then you add a hose to the cooler outlet and run it into a bucket to measure how much fluid you are pumping out. You alternate running the car for 15 seconds, turning it off, then adding more new transmission fluid through the dipstick opening. I completely replaced my transmission fluid on my Mazda that way. My bucket had quart markings on it, so I knew how much fluid I was pumping out to know how many quarts to put back in. Once I got slightly past the rated fluid capacity of the transmission, the fluid coming out of the cooler turned from a brownish color to the red color of new coolant, so I knew that I had replaced all of the old fluid with new at that point. The process was easy. Btw, the service manual for the Mirage refers to that cooler at the transmission as a “transmission fluid cooler“, NOT as a “transmission cooler” or a “transmission coolant cooler”. Can anyone re -confirm that it is actually engine coolant running through that cooler and not transmission fluid?
    It is engine coolant, not transmission fluid. And welcome to the forum.

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 automatic: 40.5 mpg (US) ... 17.2 km/L ... 5.8 L/100 km ... 48.6 mpg (Imp)


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    Top_Fuel (08-28-2020)

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    Senior Member Top_Fuel's Avatar
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    Quote Originally Posted by Gerbur View Post
    I have a Mazda 5 that has a similar cooler on the transmission...
    ...it pumps transmission fluid, not engine coolant, through the bottom section of the radiator.
    ...you remove the one hose that pumps the transmission fluid Into the radiator
    ...add a hose to the cooler outlet and run it into a bucket
    ...alternate running the car for 15 seconds, turning it off, then adding more new transmission fluid through the dipstick opening.
    ...I completely replaced my transmission fluid on my Mazda that way.
    I get what you are saying. This is the way I normally do automatic transmission fluid changes.

    But as has been stated...a Jatco CVT has a little heat exchanger/cooler mounted on it and engine coolant flows between the radiator and the cooler...not transmission fluid.

    There are aftermarket Jatco CVT coolers with 2 sets of inlets/outlet ports. One set is for engine coolant...and the other set is for transmission fluid. If you installed one of these coolers on your CVT, you could use the transmission fluid lines to flush it like you are describing.

    Here's a video describing the aftermarket cooler...

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 52.2 mpg (US) ... 22.2 km/L ... 4.5 L/100 km ... 62.6 mpg (Imp)


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    Quote Originally Posted by Top_Fuel View Post
    I get what you are saying. This is the way I normally do automatic transmission fluid changes.

    But as has been stated...a Jatco CVT has a little heat exchanger/cooler mounted on it and engine coolant flows between the radiator and the cooler...not transmission fluid.

    There are aftermarket Jatco CVT coolers with 2 sets of inlets/outlet ports. One set is for engine coolant...and the other set is for transmission fluid. If you installed one of these coolers on your CVT, you could use the transmission fluid lines to flush it like you are describing.

    Here's a video describing the aftermarket cooler...

    Thanks for information. Yes, I see now that the cooler is actually a heat “exchanger”. And thanks for the information on the aftermarket exchanger option. I have not flushed my transmission fluid yet, still fairly low miles, but definitely want to find a way to replace 95% of the fluid without the fill-drain-fill-drain method through the dipstick tube and transmission pan drain plug.

  12. The Following User Says Thank You to Gerbur For This Useful Post:

    Dirk Diggler (08-28-2020)

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