Air, no heat '98 Astro. Blows on the floor and face. No leaks, engine thermostat never gets hot - already replaced. Hoses to/from heater core stayed cold while engine idled for 20 min. But heated up after shutting the van off. Got very slightly luke warm air, then.
Where / how do I check for cloggs in the water lines?
If your system has no airlocks, you still could have a problem with the blend door.
Or something as simple as no or not enough coolant in the reservoir or radiator?
if this is the case, you have no coolant for fluid to get hot, therefore you will get no hot air blowing into the cabin.
could also be a faulty thermostat, where it is stuck open?
And as an Astro owner, check out this forum...
http://astrosafarivans.org/bb2/viewforum.php?f=54
lots of helpful and useful information, from its members. Just like here at FixYa
good luck
It sounds to me that you may have 2 problems. 1). Air Lock in the Heater Core. 2). Inactive Heat Damper in the Plenum.
But since you state that the Heater Hoses do not get warm that is indicative of an Air Lock in the Heater Core. This is a relatively simple fix. It is best performed COLD but requires a method of pressurizing the Cooling System. All reputable Auto Parts stores Sell and/or Rent Pumps that temporarily replace the Radiator Pressure Cap for Leak tests and curing Air Lock. The Collant Level must be filled FULL then pressurized and then loosening the Highest Heater Hose at the Firewall so that Air and a Small Amount of Coolant escapes. Once all the Air has escaped tighten the Heater Hose Clamp, remove the Pressure Pump, Restore the Collant Level to FULL, re-install the Pressure Cap and Start the Engine. As it Warms up you should be able to feel coolant running through the Heater Hoses and they should become warm.
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