Question about 2003 Chevrolet S-10
Your collant level is insufficient ( too low a level ) to deliver hot coolent to the heater core....
Check coolent level in overflow bottle... it should read full....
Your thermostat is frozen open not allowing the coolent to sufficiently heat up ...
Posted on Sep 28, 2010
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Posted on Jan 02, 2017
There are two other good possibilities.
1) You may have air in the cooling system. A small leak can cause air, or if you've recently had the system drained/flushed or had any hoses replaced, air can get trapped in the system. Some models are equipped with bleed valves, usually on the thermostat housing, which allow the air to be bled out. Other systems can be bled by opening a flush valve or simply by releasing the radiator cap while the engine is cool and waiting.
2) There is a vacuum controlled flap style door that blocks access from the duct work to the heater core. This door remains closed when you have the heat off, are using AC or just plain blowers. It only opens when you select one of the "heating" modes or a mixed heat mode. If the vacuum line is plugged, torn or pinched off, no vacuum can get to that door and open it. Some doors have a cable that opens them, but it is still connected to a vacuum operated lever.
I'd check the vacuum hose first. If that's not it, move to checking your cooling system for air, or have it checked. They are both relatively inexpensive fixes compared to replacing a heater core.
Posted on Feb 10, 2009
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