A/C and heating core

SOURCE: climate control system only blow air out defrost vent

there is a good chance that you blend air door is stuck closed over your heater core and therefore not allowing the heat to flow, also your door that opens and close your direction of flow from the floor ,das,vent and defrost.your going to have to remove the lower cowling of the dash on the passenger side analso some of the center dash to actually check to see if the cable,servo motors. are acuating the doors.the issue could be just a stuck door or a misaligned cable or that it came off. that falls under the mechanical side of probabilities. electrical would most likely be a faulty selector switch or a servo motor

SOURCE: 1997 Chevrolet Cavalier A/C does not work

Your compressor's shaft seal is the most likely culprit. If you can find someone to replace the shaft seal and body gaskets in your compressor, you should be fine. Cavaliers use a V5 compressor, an excellent but leak-prone when unused.

Colin Stickland

• 22516 Answers
• Posted on Jun 21, 2009

SOURCE: 2000 Mercury Grand Marquis will only blow hot air when ac is on

needs re-gassing because one line should be hot (feed) and the return cold , This is a specialist job do not attempt to do it yourself because its extremely dangerous with very high pressures involved

SOURCE: 1998 Ford Explorer a/c not working properly

Had the same problem on 98 Eddy Bauer we have. Have you noticed that it has a tendency to belch out hot air and the blower speed slows down mostly when you accelerate or give it a little more gas to climb a hill or an overpass or even pass somebody? If this is the case there is a pressure switch that's hooked into the intake manifold were it can sense a drop in pressure and when it does it drops the ac clutch out and slows the dash blower down till the pressure comes back up. JUMP IT OUT. All your problems will go away. Thats in there to unload the engine during acceleration and heavy loads and after the switch ages it gets trigger happy and lazy about closing to bring the ac back on.

Pat - Houston

Jeff Banko

• 85 Answers
• Posted on Aug 16, 2010

SOURCE: I have a 2000 Dodge Intrepid 2.7L DOHC Engine - Climate Control

Might be the same....You may want to do the diagnosis proceedure. Alot of times its the door actuators. Servos in replace of old cable design. Usually it will be a code 46. DOOR BLEND ACTUATOR SHORT TO BATTERY.
The DTC's can be checked with the MTC control and the Odometer Display of the Mechanical Instrument Cluster if a DRBIII® scan tool is not available. The MTC control can only be placed into the diagnostic mode while the engine is running and the vehicle is not moving. To place the system into it's diagnostic mode, adjust the MTC control to the following settings:

1. The engine must be running with vehicle not moving.
2. The fan speed set to any speed except OFF.
3. The temperature control knob in full cold (full counterclockwise position).
4. The mode control knob must be placed in Defrost position (full clockwise position).
5. The A/C button can be On or Off.
6. Press and hold the rear window defogger (EBL) button until the mechanical instrument cluster odometer display indicates an "AC00". The BCM will chime once and the MTC A/C button LED will begin blinking.
7. Release the EBL button and wait until the MTC A/C button LED stops blinking. This means that the error check and climate control door calibration is complete. NOTE: It is important that no other control knob or button is pushed until all DTC's are read. Pushing any button except the A/C button or turning a control knob will end the diagnostic test without showing the rest of the DTC's. There also may be other DTC's stored in the BCM not related to the climate control system. These DTC's can only be found using the DRBIII® scan tool.
   DTC's related to the MTC control head will appear on the odometer display in numerical form after the letters "AC". The odometer display will return to normal operation if no DTC's are found. If a problem is found, then the odometer will display the letters "A/C" followed by the DTC number. The odometer display can only show one DTC at a time. Under certain circumstances, more than one DTC could be in the memory. To scroll through any additional DTC's, press the A/C button on the MTC control. The BCM will beep each time the A/C button is pushed. Continue pushing the A/C button and recording the DTC's until the odometer returns to normal operation (note the letters AC will dissapear.