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I have an A1, with 4 hours of preheat via block heater and high idle with the exhaust brake in warmup it takes about 10 min to defrost the windshield and for the heater to produce decent heat. if you were missing a regulator it would take a very long time to warm up. It could be your temp gauge...

it would take about 30 min to check, drain about 5gallons of coolant, remove grill, seperate heater hoses open heater core valve and blow air through them or flush with a hose.

How is your coolant level? I flushed and filled my coolant via a vacuum fill system. You can also take your heater apart and check the cable to the heater core valve The heat works well in my truck and it can get uncomfortably hot even here in Alaska at 20 deg with no cab insulation.