My heater blows warm air when accelerating. I have to drive around like 30 min to get warm air, never gets hot. The longer I drive the warmer it gets. Problem started after I flushed cooling system last summer. Since then I replaced heater core, thermostat, water pump. My coolant disappears little by little but I don't see any traces of coolant in oil. I also feel like a temp gauge needle little bit lower than it should be. I thought there is an air pocket and i tried to fill it, but its either is not there or I can't get it out.

 

I forgot to mention, I don't know if its important 1999 Honda Accord V6 305000 miles.

 

Did you bleed the system after flushing it?

 

My car doesn't have a bleeder, but I ran opened a radiator cap and ran engine sometimes on high rpm to get air out. I still don't know if there is air pocket or not. I was thinking to replace cooling hoses with clear ones, to see if there is air in the system

 

jack the car all the way up in the front and squeeze the hoses near the heater core with the car fully warmed up to try to move any possible air pocket out

 

Ok, I'll try. Thanks

 

If you are losing coolant, well you have a leak and need to find it.

For bleeding the system, there is a procedure for the V6's in this gen that you might want to follow just to be sure you get as much air out as possible.