I only get heat for 30 seconds after getting the car to operating temperature.

Ok so after reading up a little more online I decided to try a flush of the heater core hooked a garden hose up to a price of hose connected it to the left hose hookup and hooked another hose to the right side then flushed with water. The water flushed dirty for 10 to 15 seconds then went clear. Took a ride to the store and the heat worked and has now been working for a solid week or 2 almost a tad too hot :) Thank's for the information here and elseware.

Halomage, where did you hook the hoses up? I can barely see the hoses from the top of the engine let alone access them

The spot I hooked up to is behind the firewall. If you remove the rubber that holds the guard that covers the battery all off you will see a 2.5 inch wide hose guard remove the guard at there are the hoses that attach directly to the core.