I know just enough to probably screw something up but I really enjoy fixing things myself and learning how things work.
My 2002 taurus (non-DOHC, non SHO) was not heating. Fuses OK, blend door opening and closing, OK, Coolant levels OK. So I flushed out the heater core. Just like magic, i had really nice warm heat, up to spec.
2 days go by and i have very luke warm heat. I was thinking maybe something come through and clogged it again. I haven't flushed the core for the 2nd time.
When I did flush the core, I didn't flush the entire engine and radiator, because I did that about 2 months ago and all was "clear" so when i flushed the core this time, I just flushed out the hoses (with a garden hose with good pressure) next to the fire wall, the bypass "T" hose and the core. A LOT of sediments and junk came out, thus me having heat again. I didn't want to flush the entire system with the garden hose because logically thinking i didnt want that "junk" to go through the radiator, thermostat and engine"
Here is the strange part. Before ALL of this happened and anything was flushed, my Coolant Reserve/Fill tank had a crack in the bottom of it. So i replaced it. I read that the caps on the new tanks are crap and in my opinion, this was true. I clamped down the 2 hoses back on the tank with good hose clamps and it was fine.....UNTIL i got on the interstate at 70+ mph. In town trips I didn't have any issues, it was just when i got up to high speeds. When i would park and turn the car off, immediately the coolant filled up the plastic tank and gushed out from under the cap. I thought maybe I overfilled it so the next day I would do the same but with a little less coolant. Same results
At normal (or even a little below normal) levels of coolant, is the coolant supposed to rush back into the plastic tank fast and overfill it and gush from the lid. well, apparently not but why is this happening i wonder?
Is something else blocked maybe? The engine is not overheating.