Question about 2000 GMC New Sierra 1500

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Where is the HVAC box located on a 2000 GMC Sierra 4X4. I beleive the mixing door is not working correctly, I'm only getting warm air not hot. All ready changed thermostat and checked hoses.

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Check in the one heater hose will be a control valve. Check the operation of the valve(this is the heater control valve). If the lever on it appears to be moving. Take the valve out and manually check that the valve is opening and closing the whole way. If not replace the valve and recheck. If it is the heater core may be clogged not allowing the hot coolant to flow thru so you can get heat.

Posted on Oct 01, 2009

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Posted on Jan 02, 2017

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