Question about Cars & Trucks
Common problem. Most likely rust and / or contaminants have built up inside the heater core. Recommend a back flush of that heater core. The DIY procedure is to remove both hoses going to the heater core and attach a water hose to the "output" side. Preferable to have a "trigger grip" nozzle attachment to regulate the water. Have the other hose directed to a large container to receive the volume of water to be ejected from it. Proceed to flush the core and notice in the receiving container if rust or matter is in fact the problem. NOTE OF CAUTION: Sometimes a worn and failing heater core may be too weak for this test and may fail and be damaged. You would then need to have the core replaced and that can be a large job. Weigh your options. Most times it will be a success and your heater will be back to normal. ANOTHER PROBLEM COULD BE THE DOOR THAT SWITCHES BETWEEN A/C AND HEAT. That door is usually vacuum actuated. It could be the vac hose or diaphram is leaking at some point or the mechanical door is getting stuck. I would consult a repair manual to see how involved the repair procedure is and go from there. Good Luck!!!!!
Posted on Nov 13, 2014
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Posted on Jan 02, 2017
If you car is coming to temp but you get nothing from the heater the first place to look is the coolant valve for the heater core. It is sometimes called a mixing control. See if the control is jammed or your control cable is frozen or disconnected from this valve.
The valve should be somewhere near the cooling lines leading into the heater core. I am sorry, but they may be under the dashboard as well.
Good luck and be careful.
Posted on Dec 11, 2009
Your heater core is clogged. You can fix it. Disconnect the two heater hoses and put one into a bucket. Use an air compressor to blow into the other - it'll flush the contents into the bucket. Then reverse it - put the hose you blew into, in the bucket, and blow into the one that was in the bucket. This way, whichever side of the core had the clog, you can blow it out. Reconnect the heater hoses, and then burp the system or you can end up with air bubbles in the cooling system that can cause you to overheat. Click my screenname, go to Tips and Tricks, and follow the procedure there - it'll walk you through the whole procedure step by step.
Posted on Dec 23, 2009
common impala problem friend of mine has a 2000 with the same problem just cover the grill so that cold air does not blow into the rad it should give you your heat back
Posted on Jan 12, 2010
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