Originally Posted by byrdi
ok new thermostate and flushed the radiator and still no heat.... the upper heater core hose is really hot and the lower hose is not as hot????? what is wrong with it???
Blocked heater core .. or air lock (unlikely).
Give it a thorough flush .. do it properly.
Get some radiator flush (Prestone), dump all the coolant that will come out the bottom rad drain, re-fill with water adding the flush liquid .. follow instructions about running the engine. Let it cool down and dump the fluid again.
Repeat with another bottle of flush (if you can afford it and can be bothered).
After the final flush, dump all the water out the botttom of the rad drain, refill with clean water and run the engine up to temp again. Let it cool and dump again. Keep doing this until the water comes out clean(ish). On the last fill, fill with pure antifreeze.
If this doesn't cure it you'll need a new heater core.