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2010 Mustang V6 over heating and the cabin heater is blowning not hot air. Problem Solving
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Junior Member 2 posts Viperbax71 Junior Member 2 posts
Viperbax71
Have a 2010 Mustang V6 new rad and thermostat and system have fluid, but the car is over heating and the cabin heater is not blowing hot air. AC works fine. Could it be the heater core? canvas.jpg 
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Kurganhunter Senior Member 1,198 posts
Kurganhunter
Viperbax71, Welcome to the forum. At least she's pretty. It could be the core. 2010 is pretty new to have that though. A/C is a different system within the h.v.a.c. system. Here are some things to try in the least invasive order. Check to see that the fan is working. Check the water pump and fan fuses. With it cold, start it with the radiator cap off and see if fluid is moving once it starts to warm up. With the cap on and running see if the top hose gets hot near the thermostat when up to temp. If not, tap on the thermostat housing. Not too hard it will crack. Disconnect both heater hoses and put a garden hose on one side and see if water moves through the core. It sounds like an air pocket or a stuck thermostat. I'm sure others will jump in with ideas. Good luck, Mike
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Viperbax71 Junior Member 2 posts
Viperbax71
Thanks Mike, the fan is not on the water pump, and their is not a radiator cap. I will try the heater hose. I just replaced the thermostat.
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Kurganhunter Senior Member 1,198 posts
Kurganhunter
Check the fuse for the fan and put on a radiator cap. It will build pressure higher than atmospheric causing the fluid to boil at a higher temp. When the fluid boils it puts a gap between itself and the surface and will not cool efficiently. Also while under pressure, it may push out any air in the system.
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Wagonman100 Senior Member 132 posts
Wagonman100
Overheating and no heat usually means not enough coolant or an air pocket. If you have done anything with the cooling system lately that required draining and adding back coolant (I see you changed the radiator) it can cause an air pocket. Check your overflow bottle to see if it has enough coolant in it. If it is okay, then remove the cap and start the car and run it for a while. You should see coolant moving in the bottle and when your gauge is about half way up the coolant should really flow. If you don’t see coolant flowing you probably have a bad impeller on the water pump. What was the reason for the new radiator? If you see coolant flowing you probably have an air pocket. If it’s an air pocket, run the car and watch the gauge to make sure it doesn’t overheat again. The air pocket should burp itself out. Sometimes it takes a while and you may have to rev the engine a bit to help the water pump push the air pocket out. When it does, you will have heat again. You may have heat while revving the engine and then it goes away at idle. That is a good indicator of an air pocket. Sometimes it takes a couple of heat cycles to burp out the air. A bad or plugged heater core will not cause overheating.
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