This problem can be split into 2 main catagories. First, is whether the water is flowing through the heater core. Second, whether the ducts inside the dash are routing hot air past the heater.
You will see 2 garden hose sized water hoses going into the sheet metal where the passengers sit, called a cabin. Both of the water hoses should be hot when the engine has warmed up and is running. You need to hold both water hoses to determine their temperature.
If one hose is not hot then water flow is the problem. You would then look for flow control valves. Some are controlled by hard cables and some are controlled by vacuum and some are entirely electric solenoids.
You must find these control points and find out if they work.
The other potential problem is duct work switching under the dash. If all the hoses are hot, then some ductwork flap is not moving correctly. You would need to trace that.
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