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USALLY it's because of a BAD heater control Valve-butt the hoses can get full of crud & block the flow-ALSO if the Thermostat sticks open the engine won't develope enough Heat.& make sure there is Vaccume going 2 the Heater Control Valve.

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βˆ™ 2004-11-04 20:15:21
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Q: Why would a 2000 GMC Savanna full size van have air conditioning in the rear but no heat?
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