First post...

Got a 98 4 door that blows hot air. New compressor, new accumulator w/ low pressure switch. Reading appropriate voltage across the low pressure switch, and other electronics controlling the cycling relay seem to be in order.

I have charged/discharged the system, as well as flushed both the condenser, evaporator, and lines. From inside the car, the HVAC controls will engage the compressor, and the cycle looks to be working (compressor is on, accumulator gets icey cold), yet inside the car, all I get is hot air. The temperature control **** blows hot air on cold, and even hotter air on red. At this point, I'm thinking there is a problem with the blend door actuator inside the dash. The HVAC mode selector will send air to the proper areas (Max AC = everywhere, a/c is just up top, and defrost to the windshield). Anyone have any other thoughts on what to check before I rip out the dash and throw more money down the pit?

 

Take the blend door actuator out and try to turn the blend door by hand. Its behind the glovebox and bit difficult to reach it. Just 2-3 screws.
I think there will be cold air then

 

No mention if this is manual HVAC or Automatic Climate Control.

The accumulator is "downstream" of the evaporator. So if the accumulator is getting cold, so is the evaporator. As mentioned, look for a problem with the blend door actuator. The gear is nylon and it likes to break

This is the actuator for manual HVAC: http://shop.advanceautoparts.com/p/d...hTerm=actuator

 

I'd start by checking the vacuum lines at the left of the firewall by the brake booster. If the joints or hoses are rotting and leaking, it might not be supplying enough vacuum to engage the blend doors like it's suppose to.

 

Vacuum lines operate the actuators for air flow only. OP says that's fine. The temperature blend door actuator is electric, and known to have "issues" Not all that uncommon for a pen or something to fall in the defroster duct and jamb the door. If/when that happens, the first time you adjust the temperature, the gear will break, and you have no control of outlet temperature.

 

ah okay, got cha

 

Whaddya know. 20 minutes and $30 later, blowin cold. Thanks.

 

Was the gear broken? Did the door move freely with the actuator removed?

 

Didn't take apart the old actuator to see if the gear was bad. The spline was stiff, I could not manually move it myself. However, wiring everything back up and it opened the door just fine.

 

Check your heat