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Why isnt heat working?

I have a 98 S-10. The blower blows air but nowwarm air. I changed thermostat and I noticed when flushing the radiator that after we put more antifreeze in it and ran it the top radiator hose wasnt hot but the bottom was. Could the reason for this heat not working be the water pump not circulating?

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Yes that is very possible but if your truck did not overheat before this it is doubtful. make sure you did not put the thermostat in backwards. if you flushed out the system did you force any air through it to blow out old antifreeze? if you did, this may have broke some stuff loose in your heater core and plugged it up . it could also be air locked, if the system was completely empty and you refilled it . turn your radiator cap half open (not all the way open ) so it is still locked on but not tight and run your vehicle for a while to burp the air out of the system . add antifreeze if needed after this .

Posted on Dec 08, 2014

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