The heat will get warm if you are parked and have your foot on the gas or if you are driving but once you stop and let it idle it will go back to cool. The thermostat is installed correctly and the heater core gets hot on both the inlet and outlet sides. The fan works and so does the direction (floor, dash,defrost). Any help would be grealty appreciated.
2007-11-06 07:46:45 · 6 answers · asked by Bill K 1 in Cars & Transportation ➔ Maintenance & Repairs
If the temperature control valve, which controls the water flow through the heater core is stuck or partially clogged it can cause that. If the flow valve is O.K. then your water pump isn't circulating enough water at engine idle. With low water flow the cold air overpowers what heat the core receives from the water flowing through it. When you speed the engine up the increased speed of the engine causes the water pump to move more hot water through the heater core thereby providing enough heat transfer so that the incoming air is heated enough to make you comfortable. The vanes, on your water pump could be deteriorated from corrosion over the years. A new pump should cure the problem.
2007-11-06 07:56:09 · answer #1 · answered by mustanger 7 · 0⤊ 2⤋
It sound like the heater core is plugged, I had this same problem and after replacing all you have, I found the heater core was plugged. Turn on the heat with the hood open and see how long the two heater hoses stay hot if one gets colder than the other after a few minuets then replace the core. Good Luck and God Bless
2007-11-06 07:52:31 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Pressure test the system. Could be a pinhole in the radiator or 1 of the hoses. Also wrong radiator cap or rubber gasket around the rad cap.
2016-05-28 03:58:16 · answer #3 · answered by freeda 3 · 0⤊ 0⤋
Blend door issue-in the heater box. Common problem.
2007-11-06 07:51:05 · answer #4 · answered by ruskinflgator 5 · 0⤊ 0⤋
Its a Vaccum leak to your Temp selector. When you are at idle (lower vaccum) it will think you want a low temp. When you step on the gas and raise idle you vaccum will go up and so will the temp.
Apparently it happens to a lot of Chevys. I have had it happen my dad had it happen and other guy a few minutes ago asked about it
2007-11-06 07:58:17 · answer #5 · answered by victor s 3 · 0⤊ 2⤋
Check for vacum leak at diaphragm for vent control. Bleed coolant system of air.
2007-11-06 08:13:30 · answer #6 · answered by miiiikeee 5 · 0⤊ 0⤋