Heater on 2004 Ford Explorer

I bought vehicle without checking if the heater worked. The A/C works fine. The heater blows cold air and I do have antifreeze.

Asked by for the 2004 Ford Explorer
2 answers
the hot cold nob in dash or flush heater core take hose off flush with water hose use a hose put it on one side heater core flush then put on other hose then flush repeat till run out clear
Do you have any type of warranty? Did you buy this from a lot or private party? I would check that first. I would also call the Bureau of Automotive Repair and Dept of Consumer Affairs, since you live in CA and ask them if you have any recourse.
If you have a manual heater, then check to see if the heater hoses are in their proper place, and not by-passed, that the engine gets hot, like in the middle of the gauge and then check the heater control valve. It should be in line with one of the heater hoses going to your heater core.
If you have Automatic Climate Control again, make sure that your heater hoses are in place, that your engine is getting hot, like in the middle of the gauge and then you will have to scan the heater control computer to see what is not working correctly. I do not mean a parts store quick scan, but a data stream reading with a real scanner. Hope that this helps!