Air flow in front vents

I have an 03 Chevy trailblazer fully loaded… My vehicle recently died so I changed the battery.. The air flow in my front vents have considerably stopped blowing hard. I've done extensive research and I've tried pulling fuses and all kinds of stuff…. I read a lot about the blower motor resister… Should I replace that? Any ideas? By the way, when I put ac, or heat on the highest mode, it still doesn't blow hard. As well as if I were to lower the speed.
My car has an automatic transmission.
Experienced mechanics share their insights in answering this question :
Try to look under the glove box to see if the air intake has got anything blocking the A/C air intake. If nothing is blocking the intake of the A/C, then you would need to have the blower checked to see if it is getting all the fan speed voltages from the blower resistor. If the A/C switch for the blower is working correctly, then you may have a blower motor or resistor that is bad. The most inexpensive repair is to replace the blower resistor first, and then replace the blower motor if needed. If you’d like, you can have your AC issue diagnosed at your home or office by a technician from YourMechanic.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

Reasons a Chevrolet Trailblazer AC Isn`t Working. The most common reasons a Chevrolet Trailblazer ac isn`t working are a refrigerant leak, an electrical climate control issue, or a problem with the air conditioning compressor. You may not realize there`s a refrigerant leak until the air conditioner stops blowing cold.
The most common reasons a Chevrolet Trailblazer heater isn`t working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.
If your air conditioner is running, but not lowering temperatures inside, one issue could be a blocked or clogged condenser coil. When operating correctly, the condenser fan draws air into the outdoor unit through the condenser coil to pull heat energy out of your home.
Perhaps the most common cause of AC issues is clogged filters. Dirt, pet hair, pollen and dust can clog your filters. When filters get clogged, they begin to restrict the flow of air through your AC. The result is that the AC doesn`t cool your indoor air effectively.
Air conditioners use fuses as a way to protect the condenser from being exposed to excessive amperage. Fuses are designed to handle a limited amount of amperage based on the maximum amount that the unit is rated for: If more amperage passes through, the fuse will blow to protect the condenser from overheating.
The AC fuse on most HVAC systems is typically on the unit`s control board. You`ll normally find the board behind an access panel on the unit`s lower compartment. While you sometimes have to unscrew areas to access the control board, others have clips.
The ambient temperature sensor (switch) is located either behind the front grille or in the front bumper. Its only job is to monitor air temperature (which it does through increasing/decreasing resistance in response to temperature fluctuations).
If one or more of these issues is present, your vehicle may blow out cool air rather than heat: Not enough coolant in the engine. Problems with the heater core. Clogged or broken heating controls.
The most common causes of broken air conditioning are leaks or compressor issues. If your air is blowing cool but not cold, the problem could be a clogged filter, cooling fan problem, radiator trouble, or it could simply be that you need to recharge your AC.
Designed to protect machinery and personnel, an air fuse is a simple inline device installed in pneumatic systems that responds to issues such as a broken compressor air hose of a damaged pipe. A Pneumatic Air Fuse responds immediately by shutting off the air should the volume of air exceed a set value.
A typical vehicle will have multiple fuses connected to the operation of the AC unit. To locate the correct AC fuse(s) in your vehicle`s fuse box—and the fuse box itself—refer to your owner`s manual. You can usually tell a fuse is blown if the wire within the fuse is visibly melted or burned.
If the fuse is blown, the air conditioner will quit working and you`ll need to have your AC repaired. Repairing a blown fuse is an easy and inexpensive repair job.
Remove the fuse from its holder. In some cases you may need a small screwdriver to unscrew the fuse holder cap. Look at the fuse wire. If there is a visible gap in the wire or a dark or metallic smear inside the glass then the fuse is blown and needs to be replaced.
On average, the cost for a Chevrolet Trailblazer Car AC Repair is $249 with $116 for parts and $133 for labor.
Carrier air conditioner is not blowing cold air

Make sure your thermostat is set to “auto” and “cool.” Check if your air filter is clean. If not, replace your AC`s air filter. If that doesn`t solve the problem, your refrigerant may be low or there could be a leak in the evaporator coil.

The most common cause of a vehicle`s air conditioner not getting cold enough is that it needs to be recharged. You can recharge your refrigerant by yourself, but to save time and make sure the job is done correctly you should make an appointment with your local professional auto shop.
Carrier air conditioner is not blowing cold air

Make sure your thermostat is set to “auto” and “cool.” Check if your air filter is clean. If not, replace your AC`s air filter. If that doesn`t solve the problem, your refrigerant may be low or there could be a leak in the evaporator coil.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

air conditioner not blowing air from dash vents, but blowing air from side vents
ANSWER : A few different items can cause the air to not blow out of the dash vents. The most common are a blend door or a control switch. The best method for the AC diagnosis feature can be found in the vehicles owners manual. I recommend having your AC checked by a qualified technician, such as one from YourMechanic, to have the problem diagnosed and repaired correctly.

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Ac compressor. Blowing hot air through front vents and cold air through rear vents.
ANSWER : It sounds to me like you have a blend door actuator problem. The blend door actuator is responsible for controlling the blend door. The blend door is responsible for blocking off air to the heater core when your air conditioning is on. I would recommend having your blend door actuator tested using the manufacturer’s recommended procedure. Once this has been done, a qualified mechanic will be able to inform you of whether the actuator will require replacement in order to resolve this issue. If you need help with this repair, YourMechanic offers a repair and diagnosis service preformed by a certified mechanic that will commute to your location to look inspect your heater and AC problem.

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Problem with AC/heater – 2005 Ford Explorer
ANSWER : Hello. The problems you describe with the front system may either be a faulty control switch or faulty vacuum motors for the air blend doors. The problem in the rear is likely the rear heater control valve, which regulates the flow of hot coolant to the rear heater core and air duct system. The clicking noise may be a broken vacuum motor for that valve (integrated in the valve).

I would recommend having a certified mechanic, such as one from YourMechanic, come to your location to perform an inspection of the heater and suggest the needed repairs.

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Cold mist/smoke like air comes out of the air vents when cold air is on.
ANSWER : If you are using regular outside air a/c instead of recirculated air you may be getting a large amount of outside air humidity and can cause a mist to come out of the a/c vents. You should make sure the a/c evaporator drain is cleared and drains freely or the water in the a/c cannot drain fast enough and the blower will pick up the water and blow it out the vents.

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My heater is blowing air through the driver side air vents but is blowing cold air through the passenger side and rear console ven
ANSWER : Hi there:

Climate controlled vehicles have multiple electrical relays that open and close vents to maintain the desired temperature. In some instances, these relays can wear out overtime. However, it’s also common for debris to clog up vents (especially side vents) which may restrict the flow of cool air. The best way to determine why your AC is not working efficiently, it might be best to have a professional mechanic complete a AC inspection; so they can pinpoint the source of your issues and recommend the right repairs.

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air vents not blowing air plus heater does not get hot
ANSWER : Hi there. It is possible that the blower actuator is the source of this problem, however, before recommending replacement it is possible that a different issue is causing your problems; such as a stuck vent control arm or even a minor electrical glitch. I would recommend having a professional mechanic come to your location and complete a heater is not working inspection, so they can determine the source of your problem and complete the right repairs.

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Small rock entered through air inlet creating much damage
ANSWER : This is indeed sounds like a troublesome issue. The vehicle should be repaired using as many OEM quality parts as possible. There are no grill guards for the brakes, but there should be a splash guard in the wheel well that prevents water from splashing into the engine bay. Next time, try to avoid the situation if at all possible. Any guard put in front of the air conditioning condenser will block air flow and inhibit the air conditioning and engine cooling systems. The best thing you could do is to have the entire system inspected before moving forward with repairs. If you need help with this, a certified professional from YourMechanic can come to your car’s location to inspect your AC system and advise you on the appropriate repairs.

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Hot air mixed with cold blows from air conditioning
ANSWER : Hey there. You will most likely have to have a mechanic bypass the heater coolant lines to have this resolved. Your A/C may not be controlling the air flow inside the evaporator correctly out of the vents and may be the blend door actuator stuck in the heat position. Have the AC system diagnosed first before bypassing the heater.

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