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Auto Air Conditioner Blowing Warm Air, Not Cooling

October 19, 2012

Is you car’s air conditioner blowing warm air only and no interesting air? Your A/C cooling trouble could be brought about by any in the following:

Your A/C system could have lost its charge of refrigerant, or the compressor may not be engaging any time you turn on the A/C, or there could be an obstruction in the system, or even the mix air door inside the HVAC unit could be caught while in the Heat position so no air goes through the A/C evaporator.

Compressor Checks

Start with all the compressor. Does it engage once you turn to the A/C?

If so, the compressor is doing work along with the A/C system almost certainly is made up of sufficient refrigerant to generate cold air, so the issue is inside the HVAC unit. Change the motor that controls the blend air door (it is a difficult occupation and finest left to a professional considering that it includes tearing apart the HVAC unit — about an 8 to 10 hour job!).

If your compressor does not engage any time you turn to the A/C, see if it will run by jumping the compressor clutch wire right to the battery (use a fused jumper wire). If the compressor works once you jump it, plus the A/C blows cold air, the system is made up of refrigerant and also the fault is probably a negative A/C compressor clutch relay or possibly a negative clutch cycling switch or stress switch.

Should the compressor isn’t going to engage once you jump it, the issue is a undesirable compressor clutch.

When the clutch engages however the compressor doesn’t turn (the belt will start to slip and squeal), the compressor is locked up and also you need a new compressor.

If the compressor clutch engages and turns the compressor, however the A/C even now isn’t going to blow cold air, the system is possibly reduced on refrigerant and must be recharged.

Refrigerant Checks

Connect an A/C pressure gauge towards the Higher SIDE services port (positioned inside the substantial strain hose that runs amongst the compressor as well as condenser in the front in the engine compartment). The gauge will inform you if there is certainly any pressure during the system. Only depressing the services fitting valve by using a smaller screwdriver to check out if any refrigerant squirts out is not an correct check out due to the fact it inform you the amount pressure is from the system. It may however have some stress but not enough to trip the very low stress safety switch so the compressor will engage.

In case your A/C system is low or out of refrigerant, check for leaks, then possess the A/C system vacuum purged to remove air. After the air is out, it can be recharged using the specified quantity of refrigerant. It is crucial to acquire any air out as this will likely reduce cooling performance and may well make the compressor noisy.

A/C System Functional Checks

If your refrigeration circuit looks to become functioning (refrigerant within the system, compressor operating and making strain), but there may be nevertheless no cooling, the challenge might be an obstruction while in the orifice tube (located while in the high strain hose between the condenser from the front of the radiator, plus the evaporator found while in the passenger compartment). A blockage right here will avert the refrigerant from entering the evaporator or recirculating through the refrigeration circuit.

When the orifice tube is plugged, the large side strain reading shall be reduced than regular, and the very low side studying will also be lower than regular simply because no refrigerant is circulating from the system.

When the refrigeration circuit would seem to be functioning typically (compressor running, frost or condensation within the substantial strain line from your condenser towards the evaporator), but no amazing air is blowing out of the ducts inside the car (as well as the blower is functioning), the fault is likely a Blend AIR door that may be caught in the Warmth position, or perhaps a badly clogged cabin air filter that is restricting airflow. Yet another chance can be a fault from the automatic climate control system which include a ad interior temperature sensor or management module.

My assistance for you in case you know nothing at all about A/C service will be to locate a repair store that focuses on A/C repairs and let them diagnose and repair your air conditioning cooling issue. Today’s A/C systems with automatic climate control are extremely complicated and need unique tools and know-how to diagnose and repair.


From → Auto Repair

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