I know Tesla says no need to change coolant. And the coolant doesn't see any kind of high temps like ICE. But coolant will degrade over time and become acidic and attack seals. So seem best to change it after say 10 years as my 13 MS is coming up on this and never had a full coolant flush. Drive unit was replaced 2x and I've just finished a rebuild due to the common leaky rotor seal. Each time would have replaced 2-3L of coolant out of the total 14L capacity. So figure nearly 1/2 of the coolant are gradually newer than original.
Have never had good service at SC in out of warranty situations and they've caused damage on multiple visits. Very much like to DIY if possible.
Tesla service manual says to run a workshop routine ( PROC_THC_X_FLUID-FILL-DRAIN ) before start. Here is the coolant circuit diagram
Using Tesla thermal management system parts - EVcreate
Looking at the procedure and coolant diagram. Workshop basically want to put the coolant loop into serial mode where coolant travels in the following path
- radiator to chiller to heater to battery to drive unit and return to radiator
Then open this loop at the battery chiller. Alternatively clamp off either end of the opening and apply light air pressure from the reservoir. This basically push the coolant out from reservoir to the loop opening one path at a time. The radiator bypass line is probably quite short and minimal old coolant might remain there.
Does any know a way to force the car into the serial mode so can perform this procedure? Above link says serial mode is when the battery is cold. I guess the design concept is to route the drive unit's heat to aid in warming the battery.
If not possible, can pull 4 hoses off the 4-way valve and force a serial connection (if know which hose is which path). Finally just drain as much as possible at few low point openings. Refill and do say 2x which probably can easily exchange out 75%.
Googled and found no mentioning of DIY full coolant drain+flush. Just cooling bleeding which is pretty easy.
Have never had good service at SC in out of warranty situations and they've caused damage on multiple visits. Very much like to DIY if possible.
Tesla service manual says to run a workshop routine ( PROC_THC_X_FLUID-FILL-DRAIN ) before start. Here is the coolant circuit diagram
Using Tesla thermal management system parts - EVcreate
Looking at the procedure and coolant diagram. Workshop basically want to put the coolant loop into serial mode where coolant travels in the following path
- radiator to chiller to heater to battery to drive unit and return to radiator
Then open this loop at the battery chiller. Alternatively clamp off either end of the opening and apply light air pressure from the reservoir. This basically push the coolant out from reservoir to the loop opening one path at a time. The radiator bypass line is probably quite short and minimal old coolant might remain there.
Does any know a way to force the car into the serial mode so can perform this procedure? Above link says serial mode is when the battery is cold. I guess the design concept is to route the drive unit's heat to aid in warming the battery.
If not possible, can pull 4 hoses off the 4-way valve and force a serial connection (if know which hose is which path). Finally just drain as much as possible at few low point openings. Refill and do say 2x which probably can easily exchange out 75%.
Googled and found no mentioning of DIY full coolant drain+flush. Just cooling bleeding which is pretty easy.
