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Problem for Chevrolet 1999 Silverado 1500
1989 chevy silverado heater blowes cold air. both
1989 chevy silverado heater blowes cold air. both heater hose are hot. bargraph adjust from hot to cold.what next.
Clarification Request
Posted by mechanic144 on Nov 07, 2009
check the thermostat....sounds like its staying open...but, why the heater hoses are both hot, could also be a heater core issue as well.....
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Solution #2
posted on Nov 07, 2009
Hi, Both hoses will be hot even though you have no heat, The supply hose to the heater core has a valve in the hose that is supposed to open when you slide the lever or turn the knob to heat which ever you have. If it has an elect connection, check the heater fuse located under dash, left of drivers seat or under hood in a black plastic fuse box, cant miss it. Good Luck with this, Sincerely, Shastalaker7 PS check you're antifreeze level.
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Solution #3
posted on Nov 07, 2009
Feel the hoses going into the heater on the firewall. If one is hot and the other is cool, then the heater control valve is not working for whatever reason. Check the flow valve.
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