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If your 2004 Sierra's heater only blows hot air, it could be due to a malfunctioning blend door actuator, which controls the mixing of hot and cold air. Another possibility is a stuck or faulty thermostat that prevents the engine from reaching the proper operating temperature. Additionally, low coolant levels or a clogged heater core may also contribute to the issue. Checking these components can help identify and resolve the problem.
What else can I help you with?
Why would your heat only work on defrost?
ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air? ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air?
Your heater fan is set to max but only blows out low heat?
The heater fan ONLY blows the air, it does not make the temperature of that air. Your heater temperature controls how hot the air is. Adjust your heater temperature for hotter or cooler air.
Jeep Cherokee vent heater only blows on defogger?
heater vent will not readjust to any position
Why would a 2000 Saturn heater only blowing warm air?
it is a heater. heat. it blows heat. warm air
2004 Chevy blazer blows only cold air?
It could be the actuator that diverts the air through the heater core. Our enthusiasts forum may be able to help you more at www.trailvoy.com
Does the heater vents on a 2004 2500 dodge diesel operate on vacuum or electric My truck only blows out of the vents on the dash occationaly it will switch to defrost for me?
The doors are electric. You most likely have a broken door inside the heater box under the dash.
Your heater in your jeep only blows cold air why is this?
The most common reason a automobile heater blows cold air is the water level is low. Check the water level and fill to the appropriate level.
Silverado heater blows cold air only?
possibly thermostat stuck in the open position?
Why does my 1998 ford pickup blows only cold air when heater is on?
Because it's broken.
Why does your heater in my KIA sportage not work only blows cold air?
it has a dead raccoon stuck in it
What is wrong when the heater on a 1988 Lincoln Towan car blows only cold air when the heater is on?
An automobile's heater that blows only cold air could either be a faulty thermostat or, more likely, a faulty heater core. A trip to a mechanic or shop that specializes in radiator and cooling system repair should be able to diagnose and repair any problems.
1999 f150 heater only blows cold air?
some possibilities are. low coolant level, open thermostat, pluged heater core,
