First of all, never remove and replace parts in hopes of hitting the jack pot. This never works and only costs you money that could've been spent with a mechanic.
The most common causes of "No heat" are a clogged heater core, a coolant leak, a faulty shut off valve (heater control valve), collapsed or swollen heater hose, or an engine problem that does not allow the water pump to circulate coolant through the heater core. (Air bubbles in the system)
If you're familiar with some basic hand tools, and know your way around an engine compartment, start by eliminating each of these causes on at a time.
I strongly suggest you purchase an on-line repair manual specifically for you vehicle. ($25.00 for a year subscription)
This will give you detailed repair and testing procedures, and will come in handy the next time a problem arises. (Problems always arise)
Saturday, January 9th, 2010 AT 11:34 PM