Weak heat

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Wine Hill

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Apr 15, 2021
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Any suggestions? Replaced multiple items-- heater core and cleaned lines, new blower motor, replaced to a 195° thermostat again for 2nd time. But still not getting much heat. Still trying to troubleshoot defrost blowing out of 1 side, but all other vents working properly, but still not much heat. Truck seems to only heat up to about 170-175°, and that's it.
 

454cid

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Sep 5, 2010
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I would guess it's the blend door.

How are you checking the temperature? Some temp gauges just read low.
 
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