However, on the contrary, the blue light indicator can occasionally turn on right at startup, but this is normal. Thus, being the reason why you’re car is probably not starting. The blue light on the dashboard indicates that the temperature of your engine coolant is going too low. Clearly, normal operating temperature is indicated by the absence of any indicator light. I know if it is cold (blue indicator light), getting too warm (flashing red indicator light), and too hot (solid red indicator light). Instead I prefer to drain-and-fill more frequently than the suggested 102k miles or whatever it is the maintenance schedule calls for, to avoid creating gunk that needs to be flushed. You might be wondering what does your car trying to tell you. After a good bit of study, I realize I have no way to know the true coolant temperature of my Impreza. That's why I don't recommend flushing the system on engines where you can't get undiluted coolant. So the moment you fill back up with 50/50 mix, you'll have instantly diluted it down to less than 50/50 due to the water residing in the system. Once I let the car warm up then start driving it will eventually go away. When I start the car the coolant light is blue and stays illuminated on the dash for a while. I’ve noticed something the last few days I’m confused about. But you'll still have water sitting in the heater core and in various other cavities. 2019 Imp Sport 5dr Manual, 2023 Forester Limited, 2015 Crosstrek XV, 2001 SE Miata - Subaru Ambassador. Just got my first Subaru ever this past weekend. I usually wait until this happens before I hit the road. After about 5 minutes, the idle drops down to normal range and the indicator goes away. Unless you are Subaru fluid purists should be fine. Then test with a antifreeze tester, adjust as needed. After multiple drive, drain, and refill with distilled water plan to add undiluted blue coolant to capacity. Whenever I cold start my car, it idles at around 2k rpm and indicates the coolant temp is low. Pep Boys has an undiluted blue coolant for about 15.00 per gallon. When its blue, that means your engine isnt quite at the operational driving temperature yet. What would your strategy be to get back to 50/50 mix, given that you can only add 50/50 pre-diluted, and you can't drain all the water now sitting in your system? Sure, you can drain the overflow tank, drain the radiator, even pull a freeze plug on the engine and drain most of that. Hey all, I recently bought a 2019 impreza premium hatch one week ago. If you do what you describe in your original post, you'll have 100% water in your system from doing the flush. I think I recently mentioned this in another thread - my lament about the blue coolant only coming pre-diluted.
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