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Why does my 1999 gmc jimmy only blow cold air even if the truck is at 210?
Wiki User
∙ 14y ago
You need to back flush the heater core have had to do it to my jimmy 2 times and fixed the problem is easy fix .
Wiki User
∙ 14y ago
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Assuming you want it to blow hot air, you may be low on coolant or have a stuck open thermostat or a plugged heater core or you have a faulty temperature blend door actuator.
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