So I had a major coolant leak because of a vaporized Oring in the heater inlet pipe. I replaced the Oring....no more leak BUT heater still doesn't warm up?
Any suggestions?

Thanks
Reza

 

Backflush it using a garden hose, then fill and bleed the system, then take it for a drive on the highway with the transmission in third gear for a while to move enough coolant through the heater core to force out all of the air. Bleed the system once more and top it off and you should be good. The top of the heater core is above the outlet so it traps air. You can't fill it with gravity, it needs to fill using the flow from water pump. I had a waterfall sound in mine after I did it and the only way I got rid of it was by running it on the highway for a while.


After I flushed mine with the hose I blew out the tap water with a shop-vac then flushed it with distilled then I added the coolant.

 

Don't drive it.
The cooling system needs bleed.
There is probably the waterfall sound when you accelerate from a stop light.