I have a 2001 dodge 1500... my heater is blowing cold air and I can't seem to figure out how to fix this problem... fan and switches are working don't see any leaks under the hood or inside the cab... help please.

Hey, so I found an article for you that helps with the dodge RAM not blowing hot air (http://www.heatersonsale.com/1820-dodge-ram-2001-heater-problems.heat). Likely you will need to talk to a mechanic. It could be a problem with your heater core, or other. But likely best to have a mechanic check it over

Also, you may consider a 12 volt heater for now instead of replacing the heater core (or whatsoever mechanical work is required). The mechanic will for sure cost some hundreds, while a 12v heater is as low as $15 or $20.

Reverse flush the heater core--pretty simple to do.