Summary: This article is about Dodge Ram pick up trucks that have a common air-flow problem with the HVAC (Heating Ventilation & Air Conditioning) system. The problem causes little heat (or AC depending the time of the year) to flow through the vents. The blower fan can typically be heard with no abnormal sounds, although no air seems to be making it out of  the vents. We go over parts that need to be removed to gain access to replace a common failed component.

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2004 Dodge Stratus 

In this automotive repair blog, we provide some helpful information on how to R&R (Remove and Replace) the evaporator in a 2004 Dodge Stratus. Replacing the heater core is basically the same job, except for the replacement of the receiver drier. These tips are for the 4 door sedan, yes the the coupe and the convertible may be different depending on the year. If working on a different model or year it would be advisable to refer to an auto repair manual. Auto repair manuals provide detailed info on changing components like the evaporator in any model. Just keep in mind that for evaporator or heater core replacement, most of them will say “see removal of instrument panel.” Which is accurate except for the fact that if all you’re doing is moving the dash to access the evaporator case, dismantling the dash isn’t really needed. If the instrument panel is removed as described in most auto repair manuals, many more parts will be removed unnecessarily.

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Leaves accumulated near the fresh air intake can enter the car’s evaporator case.

There are several things that can cause low airflow from a vehicle’s air conditioning system. The strongest blowing vents are the middle ones with the setting adjusted to maximum or recirculate. On the max setting, the air is recirculated in the passenger compartment. Obstructions can include leaves, loose articles from the glove-box, a broken or out of position door in the Heating Ventilating & Air Conditioning (HVAC) case.

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Robinair AC Manifold gauge set was originally for R12, it has been adapted for 134A

To properly diagnose an AC system the use of a manifold gauge set is needed. AC gauge pressure readings help professional auto technicians determine if the system is low and exactly what is going on with the car’s A/C system. A 134A gauge set is also used when attaching a vacuum pump to the car for evacuating/removing the air out of AC components. If air is left in the system, the moisture it contains combines with refrigerant under pressure can cause a corrosive acid to form that can destroy evaporators, condensers or even the AC compressor from the inside.

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AC Machine by Robinair

Robinair AC machines are the most popular machines for servicing car air conditioning systems in repair shops throuought the USA. Robinair is an industry leader in the air conditioning field, developing new and innovative products. Robinair was started in 1956 by the Kent-Moore Corporation in Michigan. The Robinair division of Kent Moore was created to design and manufacture specialty tools for repairing home appliances.

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New cars don’t stay new for long – sooner or later the AC will need Freon added

Adding freon or topping off a cars A/C system is the most common task performed to restore performance and get cold air blowing again. However, adding refrigerant isn’t always the solution for car air conditioning problems. There can be many other things wrong besides a system being low on refrigerant. To diagnose problems, an A/C manifold gauge set is needed to read high and low side pressure readings. Avoid adding refrigerant with a simple charging kit like the ones sold at parts stores. Don’t add any stop leak, this can cause problems in the compressor, expansion valve or condenser.

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