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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

Resolved Question:

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
Submitted: 4 years ago.
Category: Chevy
Expert:  Tim West replied 4 years ago.
thanks for visiting Just Answer,
Feel the heater hoses with the heater on, do they get hot?
Customer: replied 4 years ago.
i just ran motor got back up to temp, heater hoses are barely lukewarm
Expert:  Tim West replied 4 years ago.
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 4 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.
Expert:  Tim West replied 4 years ago.
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.
Tim West, ASE Certified Technician
Category: Chevy
Satisfied Customers: 4638
Experience: ASE Certified Service manager of Firestone
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Tim West
Tim West
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ASE Certified Service manager of Firestone