Why are the vents on my Chevy Silverado not blowing air?

OK, trying to help my 82 y/o Dad figure out a problem he is having on his 2001 Chevy Silverado. The dashboard vents will not blow any air but the defrost and floor vents work fine. Not a blower motor issue, can be heard running.

Why are my dashboard vents not blowing air?

The dashboard vents will not blow any air but the defrost and floor vents work fine. Not a blower motor issue, can be heard running. Thought it could be a blin door issue but that seems to be more related to temperature control than what vent the air is discharged from.

How do you get air out of a Chevy Silverado?

In these cases, a coolant back flush is required to remove the air from the heating system. Locate the hoses that enter the heater core. Disconnect them to release any trapped air. Reconnect the lines. Top off the coolant. Flgure 3. Flush the heater system. This procedure refers to a quick release of air from the system.

How can I Check my Chevy Silverado’s air conditioning?

Use a pressure gauge with a specialized air conditioning fitting to check the low pressure hose on the truck and make sure it maintains 100 psi with the engine off, and 35 psi with it on. First start the car and turn all the knobs to cold and max A/C.

Is there issue with auto climate control not changing from vent to vent?

Has anyone had an issue with the auto climate control not changing from vent to vent? Re: Fan Only Blows Defrost, Won’t Change To Floor Or Vent. Pull the negative battery cable and re-install, making sure it is very tight (also check the positive to make sure it is tight). See if this fixes the problem.

What should I do if my GM fan won’t turn on?

Pull the negative battery cable and re-install, making sure it is very tight (also check the positive to make sure it is tight). See if this fixes the problem. Many of GM’s AC control heads have a built in reset feature that when power is removed and then applied it will go through a cycle that activates all the vent doors and mode doors.

Why is the vent control on my 2002 Silverado not working?

Vent control 2002 Chevy Silverado won’t switch between floor, defrost or “main”. It is stuck on “main”. Do I need to replace actuator or is there a vacuum leak somewhere?

How does the HVAC actuator work on a GM Sparkys?

The driver set when set to “hot” would produce heat through the ducts. The Passenger side would not blow heat on the “hot” setting but it would blow heat when set to “cold” on the Tech2. The temperature sensor readings were interesting as well.

Why does my GM Sparkys not blow heat?

The Passenger side would not blow heat on the “hot” setting but it would blow heat when set to “cold” on the Tech2. The temperature sensor readings were interesting as well. The outside ambient air temperature was reporting correctly; the Tech2 and rearview mirror numbers matched.

Why are there no air vents in my GMC Envoy?

The inside climate adjustment always shows 50 degrees but when it’s rainy or humid it goes down into the negative numbers then shows on the dash ice possible. Then it slowly creeps back up to 50 again and starts to blow cold and not through the top vents.

How is the heat in my Silverado truck?

First, and most important problem: The heat in my truck is virtually non-existent. After about 10 minutes, it will blow warm air (not hot), but only if it’s above 40-45 degrees. Anything under that (40 and below), it blows kind of lukewarm air, barely warmer than the inside temperature of the truck.

Why is hot air blowing out of my side vents?

It sounds like the air door actuator is bad for that side Rod. Sometimes they strip out & reclycling the key or disconnecting the battery repositions them, but it doesn’t last long before they’re off again & can’t move the air door or keep it tightly closed, so you end up getting heated air instead of AC.

Why does my Chevy truck have no heat?

If your heater core is still cold, there are four possible additional problems: first, the thermostat is stuck open, allowing coolant circulation at all times, thus never allowing the engine to warm up. You will be able to tell this from your temperature gauge, it shud be somewhere in the middle.

Where are the vents on my GMC Sierra?

No output on dash face vents or defrost vents but floor works ok. I have tried the pulling the fuses both under hood and left of dash but that did not fix my problem.

Why is there no air coming out of the vents?

This should cause the control head to go through a sync mode with all the output devices (mode, recirc, etc.). It’s a long shot, but sometimes those control heads go out of sync for no obvious reason.

Why is there no air coming out of my blower?

Have replaced the actuators, and the main controller. It does it no matter if you are running heat or A/C. Have changed the orfice to help get rid of some of the water build up. Still have same problem. Vents seem to work good until i select defrost and then the flow goes away.

What can be the cause of my Chevy Silverado having an AC problem?

2001 Chevrolet Silverado is having an ac problem: air is not getting cold. What can be the cause? Hi my name is XXXXX XXXXX Your complete satisfaction is my goal. Please provide as much information about your concern as you can.

Why does my Chevy Silverado blower motor not run?

If the blower motor runs when all of the terminals were jumped together, it means the circuit between the resistor connector and blower motor is fine as well as the blower’s motor relay, but the blower resistor is bad and needs to be replaced.

What kind of air blower does a diesel truck have?

New here and searched but could not come up with an answer. 2003 2500 HD with a Diesel. I have good air circulation when truck is first started then it goes away. I have all my speeds and you can hear it running but not getting any thing out any of the vents.

Why is there no air coming out of the radiator?

This may not be the correct answer but I get the same problem on my work truck (2005 freightliner) and the problem is that if the a/c is used when temp outside is cool the a/c core or whatever the radiator type thing is under the dash gets frozen over and will not let the air blow through the vents….

How to troubleshoot and repair vents low air flow?

Easy step by step guide one how to troubleshoot and repair vent low air flow, this article pertains to most vehicles. Step 1 – Most air control vents are equipped with a flow control door that is located at the vent outlet. This door is controlled by a thumb wheel that when activated will open and close the vent air flow door.

Where are the vents on a car located?

Step 1 – Most air control vents are equipped with a flow control door that is located at the vent outlet. This door is controlled by a thumb wheel that when activated will open and close the vent air flow door. Work the thumb wheel from one side to the other while checking the airflow.

If this filter becomes clogged due to lack maintenance it will stop or slow the flow of air exiting the vents. To check this filter locate the filter housing which can be either under the dash on the passenger side or under the hood of the car, near the base of the windshield on the passenger side, remove the cabin air filter and inspect.

Why does the AC only blow out the defrost vent?

Click to expand… Mode door actuator for where it’s blowing. Blend door actuator for hot/cold. These are more likely culprits than the control module in the front. The rear control module being bad is more common. How can I post this message for help?

How do I stop no air from dashboard vents?

This door is controlled by a thumb wheel that when activated will open and close the vent air flow door. Work the thumb wheel from one side to the other while checking the airflow. The flow should stop and start again, if the thumb wheel does not make a difference the problem is somewhere else.

What to do if your GM fan won’t defrost?

See if this fixes the problem. Many of GM’s AC control heads have a built in reset feature that when power is removed and then applied it will go through a cycle that activates all the vent doors and mode doors. It’s worth a try.

What causes air vents to stay in defrost position?

If you have an older car then the defroster system is controlled by using vacuum supplied by the engine. Lift the hood and inspect the vacuum hose or tube that leads from the intake manifold to the passenger’s side firewall. The image below shows a typical line break which causes the vents to stay in the defrost position.

Can a climate control fan only blow defrost?

SilveradoSierra.com • Fan Only Blows Defrost, Won’t Change To Floor Or Vent. : Climate Control Fan Only Blows Defrost, Won’t Change To Floor Or Vent.

Why are the vents on my Chevy Silverado not blowing air?