2003 Mitsubishi Eclipse 6 cyl Two Wheel Drive Automatic 55000 miles
I know heaters don't just start blowing hot air. I will go outside and start it and let it warm up for about 15 minutes. When I come out it still is blowing cold air. When I start to drive it takes about 3 miles before ti begins to blow the hot air. What do you think is wrong? Coolant? Core?
Go get a prestone flush kit, then install the tee on your heater line, open the drain at the bottom of the radiator, this may require the removal of the splash shiel under the engine, Attach a garden hose with the supplied adapter, turn it on after the old coolant is drained, run till water is clear. Then drain the water, close radiator, fill with 50-50 antifreeze mix!
To get a good flush of the heater core clamp off the hose behind the tee, this will increase flow thru the core. Change the thermostat.