Having problems with your 1999 Chevrolet Silverado 1500 ?
1989 chevy silverado heater blowes cold air. both heater hose are hot. bargraph adjust from hot to cold.what next.
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.
Sounds like the blend air door inside your heater box may not be moving this could be because of an actuator problem or the door may be broken.
Repair Help & Product Troubleshooting for 1999 Chevrolet Silverado 1500
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