1993 Honda Del Sol 4 cyl Manual 75000 miles
The car kept overheating. We replaced the thermostat and the radiator cap, but still overheating. We flushed the radiator - at first nothing was coming out of the hose but when we applied more water pressure, we got radiator coolant and then finally fresh water. We flushed it the other way too so that fresh water was coming out of top of radiator. This seems to have solved the problem of overheating but now we can't seem to get any heat inside the car and winter is coming. Any thoughts?
First make sure that the water valve is functioning properly. This is located on the passenger side right near the firewall. You see a heater hose going to it and out of it and a little cable (coming from your climate control inside the car) that operates it open and close. Make sure with the heat on that both ends of the hose are hot (obviously the car has to be warmed up). If that passes then you may have a clogged heater core. To test this at home just feel the temperature of both heater hoses and compare. One should be a bit hotter, but not by much. If one is pretty cool and the other is hot, that means your core is plugged. You can try flushing it out the sameway you flushed your rad, but you may have to replace the core in the end.