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No heat

(1991 Chevrolet S10)
in Bethany, OK on January 04, 2010
91 s-10 4wd heater core flushed still blows cold, is there a control valve somewhere?
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Popular Answer
on January 15, 2010
Yes there is, it should be in line in 1 of your heater hoses. Be sure that the Thermostat works properly. You can test the t-stat by warming up the engine and making sure that BOTH the upper and lower radiator hoses get really hot
on December 07, 2010
I have 99 s 10. I looked at the heater hoses in the engine compartment but did not see control valve. Is it somewhere else on 1999 or do I not know what I am looking to find?
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