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First things first.....You must have the air conditioning system hooked up to an a/c system machine and then checked for leaks and also read low and high side pressures. If there are leaks then low Freon (R134a) content and low refrigerant oil can cause the a/c system to not engage the a/c compressor which basically means you will not have proper defrost functionality nor regular air conditioning. Most shops, when working with your air conditioning, will install air conditioning dye to assist them in locating leaks and is the first step in diagnosing all a/c systems. Post the findings after thw
I've have never heard of a "only cold air system", but hey, nothing surprises me anymore. try replacing the control unit in the front. hopefully that will take care of the problem. If not you need to check your blend valve. (headache depending on location)
One of two probable problems:
1. The Heater / Air Condition Control is going bad or is bad.
a. Disconnect the negative side of the battery.
b. Remove the Heater / AC face plate off the front. To do this: Remove the two (2) screws on the top lip of the plate.
c. Disconnect the electrical connectors from the rear of the Control Module.
2. The Heater Core is defective and needs to be replaced.
Sorry, but it has to be noted that the dealer or repair shop ($$) can diagnose the system at the Heater / AC Control Module. Also, after you replace this Module: a diagnostic and re-calibration tests are needed to be performed.
Let me know if this helped or if you have additional questions or information. Feel free to contact me at FixYa.com!
Since warm air eventually comes out when the vehicle is in motion, you may have an air mix door that is stuck in fresh or is somehow blocking warm air from the heater core.
To see if the air mix control motor is bad, you need to retrieve your Diagnostic trouble codes (DTC's) from the heater control panel. To run the diagnostic function, do the following: 1. Turn the ignition switch ON (II). 2. Turn the fan switch OFF. 3. Press the recirc control button to select Recirc (recirc light on.) 4. Press and hold the recirc button to select Fresh (recirc light off) and continue to hold the button down until the recirc light comes on for two seconds and then goes off. 5. If the system is okay, the recirc light stays off. 6. If there is a problem, the recirc light blinks the DTC to indicate the trouble. One blink=a problem in the air mix control motor circuit. Two blinks=problem in the mode control motor circuit Three blinks=problem in evaporator temp sensor circuit. 7. Turn the ignition switch off to cancel the self diagnosis function. Run the diagnostic again after repairs are complete.
Note: the air mix control motor has a rod which connects to a plastic link. The link controls the mix doors and also connects to the heater control water valve via a cable. The air mix motor may check okay, but if the link is broken then you will still have problems. the motor is on the bottom of the heater unit in the front passenger's foot well.
you will need to drain all fluids and pull plugs out. if it was not running when flooded you should be able to save. remove plugs and disable fuel/ignition system spin over to blow out the water in cylinders