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2013 Chevrolet Suburban
Platform: GMT 400, 800, 900

Heater blows cold

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Old December 18th, 2018, 3:43 PM
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Default Heater blows cold
2008 Chevrolet Tahoe LTZ A/C works well. Heater blows cold; it blows cold no matter how high the temperature is set. What could it be?
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Old December 18th, 2018, 5:23 PM
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What is the temp gauge showing?
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Old December 19th, 2018, 8:40 AM
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Originally Posted by Sonny B
Have you burped the system.. you my have air lock in the heater core or in you block.. it's a must if you changed t-stat or water pump...
Check the two heater hoses going into the firewall in the engine compartment after driving 15 minutes; if not hot, see above, after confirming proper level of coolant.

If that's OK, strongly suspect a bad actuator under the dash, these control the air flow, like over the heater core or not. I had to replace one on my 2005 Yukon.
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