Question about 1997 Chevrolet Astro

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Heater lets out cold air after a while that its been on

The heater works good for a while then after a while it lets out cold air

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Possibly a sticking thermostat

Posted on Jan 06, 2009


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How do i fix my heater on my 2012 dodge durango its blowing cold air

Make sure that your coolant level is filled. If it's not, fill it and run it. Also try flushing the heater core to make sure you don't have debris in the core. Use a garden hose for this. Simply disconnect both hoses and put the garden hose to one side and let it flow out of the other until you see clean fluid coming out. Reconnect the hoses and fill. Run it again and see if that helps any. Check that the heater blend door is actually moving from hot to cold also. It may be stuck in the cold position casing your problem. Hope this helps. Good luck.

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there may be an air lock in the system that is not allowing the coolant to flow through the heater. Check the vent control module as it may not be switching on the tap for the heater.

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sounds like your heater core or you are low on water it could also be your vacum valve that lets hot water ciculate through the heater core giving you heatcheck all 3 things.

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you might have a problem with your heater core ,also check your radiator and make sure it is full if you are low on water that will also cause cold air to blow or your actuator witch is a control switch that opens the vale to let hot water pass through giving you hot air good luck

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Temperature gauge goes up blower motor works but absolutely know warm let alone hot air and its cold in michigan.

The first thing I would check is the level of antifreeze in the radiator. If it is low, you need to find out why. Hose or water pump leaking, blown head gasket, etc.

If it is not low, possible air mix door malfunction or clogged heater core.

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Heater not working

try flushing out your heater core. sometimes it gets a scale build up and restrickes the flow thru it. what i do is remove both heater hoses to heater core and mix up some water and baking soda and pour it in the heater core and let it set for about a half hour then flush. you might also want to blow the antifreeze out of core be fore you do this as so you get enought of the solution in it. just make sure you flush it out both ways. use a garden hose for this. it makes a mess. but it could be a cheap fix. good luck.

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