Question about 2003 Chevrolet S-10

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Heater not working but some heat

Tested temp control switch it works, fan works,

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  • upton52 Dec 28, 2008

    thank you I will try it out sounds like a fix.

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Quick test. Get the engine warmed up and turn the heater on. now feel the heater hoses between the engine and firewall. if they are not getting hot together, there is little or restricted flow through the heater core. look for the heater control valve along the same hoses. it may be stuck or clocgged (you could remove ithe valve and replace with tubing during winter to bypass the issue)

Posted on Dec 24, 2008

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Posted on Jan 02, 2017

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1 Answer

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Check to see if both heater hoses are hot when the engine has heated up and the heater is running.

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1 Answer

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