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Tim West
Tim West, ASE Certified Technician
Category: Chevy
Satisfied Customers: 4638
Experience:  ASE Certified Service manager of Firestone
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i ahev a 2003 chevy s10 4.3, heater is not working. the heater

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i ahev a 2003 chevy s10 4.3, heater is not working. the heater core is not leaking, a/c blows cold, actuator doors are switching all positions, key on motor off, i turn control t-stat and blower on 4, i hear difference in sound of air blowing, suggesting that the actuator door is working. so now im open to suggestions. thanks gregg
thanks for visiting Just Answer,
Feel the heater hoses with the heater on, do they get hot?
Customer: replied 6 years ago.
i just ran motor got back up to temp, heater hoses are barely lukewarm
Try flushing out the heater core. You might make a mess doing it but these are pretty common to clog. If the heater hoses are cold, it's likely there isn't very good flow and causinng your problem. I use compressed air (high pressure), it blows coolant everywhere but it works.
Does this make sense?
Customer: replied 6 years ago.
yes it does, just remove hoses from core, and shoot ait in it right? i flushed with water bout 6 months ago when i bought the truck, but i went thru lower and upper hoses, i will definitely try this tomorrow, if by chance that doesnt work, any firther suggestions? thanks for your help.
Well, I suspect the problem to be in the cooling system, so check the feel of the radiator hoses, if they are cold you could have a thermostat stuck open or other cooling system problem. Be careful blowing out coolant, it can get messy.
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