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needs the water system back flushing out, heater being cold is its blocked up some time a few back flushes and forward flushes with a hose pipe should free up the dirt inside, same with the engine and radiator. there are meany videos on you tube to help you understand how to back flush you engie. but do the radiator and engine and heater separate so the muck does not go back into the engine.
Factory came with Dex-cool. That is a GM style. If you have not owned the Astro all of it's life use the Universal style. That will mix with any brand. Use a antifreeze tester( couple dollars) and get it at least down to the record low for where you live. Wayne
You have an air pocket trapped in the cooling system. This is pretty common on this vehicle due to the fact the heater core sits higher in the vehicle than the top of the radiator.
To correct this jack the front of the vehicle up or park it on an incline. Remove radiator cap then run it until hot,run rpm up to about 1500 and watch bubbles in radiator then top it back up with coolant until u see a steady flow thru radiator.
Try replacing the Hall Effect Sensor that's underneath the Distributor. It consists of a round disk with a pick-up coil that senses rotation of the distributor shaft. The connection to the coil may become intermittent or open up completely. The engine will shut down when this happens. For a while the problem may be heat-sensitive or affected by vibration.
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