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Hello and thanks for your response. I came here to seek some help, so I was expecting that, I didn’t know I needed proper formatting for this but now I do. Also I don’t know much about cars, what I’ve learned is through friends and YouTube, the very basics. I’m learning. I bought this used car and noticed that the reservoir was dirty and that the coolant was on the low end. I though that perhaps doing a flush would be a good idea as I didn’t know how well the owner took care of this car. Besides the radiator it appears that the engine block also holds coolant but this is just a guess from watching 1 tutorial, all other tutorials I watched did now show me to drain the engine block. Please correct me if I’m wrong and thanks again for taking the time to reply. edit: my problem is with the manual, why is it showing me how to drain only 1 gallon of the coolant but tells me to buy 2 gallons before draining it the way it is shown on the manual. Shouldn’t the manual have shown how to drain all 2 gallons it it’s making me buy and use 2 gallons of coolant?

Hello I have an old Subaru 2008 Impreza, it was a used car I bought from someone a few months ago. When I emptied the coolant out of the radiator (I had to do it from the hose because the plug was stripped) about a bit over a gallon of coolant came out. Reading the manual, it says that you need to put in 2 gallons of coolant. So I decided to start filling it up with a radiator flush + cleaner and then give it distilled water , but it only took 1 gallon of distilled water, again, which I thought it should be 2? Even while running the car, I could still only fit 1 gallon of water. I’m about to drain it out and put in the new coolant, but am I doing some thing wrong? Shouldn't I be able to put the 2 gallons that is required on the manual? Why am I only getting 1 gallon out and can only fit 1 gallon in? I’m a newb with cars and this is my first flush. Any help would be appreciated, thanks!