Automotive AC Not Blowing Chilly Air? – Diagnose and Repair – Knowledgeable Ideas

How one can examine a automobile with an AC blowing scorching air and never chilly air

Test the AC Condenser and Cooling Followers

You’ll wish to begin on the entrance of the automobile the place the AC condenser is situated. The condenser appears to be like much like a radiator, and it’s typically in entrance of the radiator. The AC condenser will want clear cooling followers to work in order that the refrigerant flowing by way of the condenser can quiet down.

Examine the Cooling Followers for Particles and FunctionalitySince you want airflow to chill down the condenser, you want the cooling followers to work. The condenser received’t quiet down in the event that they’re solely partially working. The AC won’t work properly or in any respect.

Ensure there is no such thing as a particles on the cooling followers. Particles like leaves in entrance of the condenser or cooling followers will have an effect on the AC system’s means to work. Should you discover any leaves, filth, mud, or different particles, clear it off. You are able to do this with a backyard hose.

You’ll be able to even activate the AC system and see if the cooling followers work. The followers won’t work due to defective motors, a nasty relay, blown fuse, or one other electrical subject.

On most automobiles, as soon as the AC is turned on, each followers ought to be on at virtually full capability.

Examine the AC Condenser for Leaks or DamageThe AC condenser works by having compressed refrigerant enter one facet, and because it travels by way of the airflow from the entrance of the automobile and cooling followers cool it off earlier than the refrigerant exits.

Test the condenser for stains, which is an indication of a leak. That is particularly widespread within the decrease or higher nook areas. The condenser may additionally have injury, which might trigger a leak and signs in your automobile just like the AC blowing scorching air. Ensure the condenser has no punctured or damaged strains.

Extra on methods to examine the AC condenser

Test the AC Compressor

The AC compressor makes up a lot of the AC system. It pumps refrigerant all through the system and is pushed by a belt that spins a pulley. When the compressor’s clutch is engaged, it engages the compressor. It will compress refrigerant and push it all through the AC system.

Test the AC compressor’s belt. If it fell off, the compressor received’t work. Check out the belt for put on. You would possibly simply have to exchange the belt. Usually there’s a tensioner or loafer pulley that has seized up, and that’s truly simply what must be changed. That may additionally pop the belt off.

Activate the AC system and watch it. If the belt that goes across the compressor pulley is working fantastic, pay attention for the compressor clutch kicking on and off quickly. That’s a sign of low refrigerant. If refrigerant is low, it’s as a result of there’s a leak within the system. You’ll must deliver your automobile to an expert and have them use a particular machine to repair it.

You’ll see strains and hoses related to the compressor. You might even see stains the place it appears to be like like oil is leaking, which almost definitely means refrigerant is leaking. The leak will have to be repaired earlier than including extra refrigerant to the system.

Test the Evaporator Core

The EVAP core is behind the firewall. It’s hooked up to strains and works much like a radiator. Sizzling air goes by way of the EVAP core the place it cools down to provide you chilly air from the vents. If there’s no stream, it received’t have the ability to cool the air down, leaving you with an AC in your automobile that isn’t blowing chilly air.

If the EVAP core is plugged with particles like pet hair, leaves, or pine needles, the air received’t stream as properly. Weak airflow could possibly be an indication that you just simply must take away the cabin air filter and presumably the blower motor. When you’ve received sufficient house to work with, you will get on this space and vacuum it out.

Test the Cabin Air Filter

Should you discover your AC has weak airflow from the vents, making it really feel hotter in your automobile than it ought to, you may need a nasty cabin air filter. The filter could possibly be soiled and clogged with particles like leaves, pine needles, or acorns.

The cabin air filter is situated behind the glove field in its personal compartment in most automobiles. Take away and it, and exchange it when you discover it’s soiled and filled with particles.

Extra on methods to verify the cabin air filter

Test the Drains

The drains let the AC system leak out water. That’s why on a scorching day after driving with the AC on, you’ll discover water stains beneath your automobile.

If the drains are plugged with leaves or pine needles, you could discover water dripping in your ft or the carpet as an alternative of out of doors your automobile.

Test the Blower Motor

Should you activate the AC and discover no air blowing from the vents, there may be a problem with the blower motor. The blower motor resistor or the blower motor won’t be working. There could possibly be an issue with the wiring or a blown fuse.

Extra on methods to examine the blower motor and blower motor resistor

Test the Electrical System or Fuses and Relays

Test the fuses and relays. Fuses don’t blow on their very own, so when you discover a blown fuse, that’s a sign of {an electrical} drawback.

Extra on methods to diagnose fuses

You’ll be able to take a look at the relays by swapping one relay with one other recognized relay. Discover a relay with the identical quantity because the one you’re testing, swap them, after which see if it’s nonetheless working.

Extra on methods to diagnose relays