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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
Do you have enough antifeeze in your cooling system. If not fill & check again for heat. You may have a blockage. If so remove the in & out hoses to the heater core on firewall. Be careful not to damage core. Use a garden hose to flush the core one side to the other untill running clear water. put one hose on tight & clamp, put other on loose. Have someone start engine & slowly remove loose hose to let air escape. when fluid appears put hose on & tighten. Refill rad & resevoir. Heat engine up & check for heat. Also heat cable may be off under dash.
Posted on Sep 12, 2009
Probably air locked. check to see if one of the hoses leading into heater is hot. Other cause could be heater solenoid control valve faulty. Very unlikely that the heater matrix is blocked. Easiest way to bleed heater is to remove hose's when car is cold and GENTLY flush through with garden hose and push hoses back on when full of water, so you know you have a heater full of fluid. Hope this helps
Posted on Jan 11, 2011
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