Question about 1998 Chevrolet Cavalier

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'98 Chevy Cavalier, AC never cools. Frost forms on the small line between the firewall and the condenser, but only hot air comes from the vents. The air control seems to work sending air to the floor or the vents, etc. the temp control will make it hotter when turned up, but never cools inside. Help me I'm melting! Thanks, Hot Ed

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You will need to check with a/c gauges, most of the time when a/c line frost is a sign of low on freon.

Posted on May 27, 2010

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You could have a stuck Expansion Valve or Orifice Tube, it is usually located by the firewall.

ORIFICE TUBE The orifice tube, probably the most commonly used, can be found in most GM and Ford models. It is located in the inlet tube of the evaporator, or in the liquid line, somewhere between the outlet of the condenser and the inlet of the evaporator. This point can be found in a properly functioning system by locating the area between the outlet of the condenser and the inlet of the evaporator that suddenly makes the change from hot to cold. You should then see small dimples placed in the line that keep the orifice tube from moving. Most of the orifice tubes in use today measure approximately three inches in length and consist of a small brass tube, surrounded by plastic, and covered with a filter screen at each end. It is not uncommon for these tubes to become clogged with small debris. While inexpensive, usually between three to five dollars, the labor to replace one involves recovering the refrigerant, opening the system up, replacing the orifice tube, evacuating and then recharging. With this in mind, it might make sense to install a larger pre filter in front of the orifice tube to minimize the risk of of this problem reoccurring. Some Ford models have a permanently affixed orifice tube in the liquid line. These can be cut out and replaced with a combination filter/orifice assembly.

Posted on May 27, 2010

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Your system has leaked out some of the r-134a refrigerant and needs to be recharged after finding the leak, if the frost comes and goes,there is still some left in the sealed system,but not enough to do any cooling,you can just top off the system(not reccommended) or do it right and get it repaired, pressure checked, vacuumed down, and the proper amount of recharge added to the system

Posted on May 27, 2010

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