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after checking coolant level,thermostat operation and if heater hoses feel hot(be careful not to burn your hand) the temperature blend door is probably at fault. It directs the air from the fan blower motor either across your heater core or A/C evaporator, giving you either hot or cold air. Most cases the dash has to come out to replace this $80 electronic motor. Good luck, Mr.P
Let me start by saying the people who answer questions on this site are volunteers, not employees. And this is the first time I have seen this question. Now, here are some of the possible reasons for cold air sometimes. The blend doors that control air flow and the heater are vac operated. You may have a vac leak or a blend door not working correctly. If the problem happens depending on engine speed, the fan clutch may be faulty and not pulling enough air thru the radiator. If the problem is because the compressor stops running, you would need to check for voltage at the compressor and the relay. You could also have a low or high pressure switch that is coming and going.
the control unit is no good.i had a similar situation with a 98 tracker,and installed a switch to give it a ground for the compressor relay that comes from the a/c computer module.
it works good and goes on and off with the a/c switch.
on climate control press off and heat button and let go quickly. Then press automatic. The display will start rotating eventually displaying a code 025,125 , 024 etc. Then press defrost to stop. You may hear blend door operating atb that time. It worked for my climate control.
yes I am an old school mechanic myself and you can fix this in the drive way yourself the relay for the fan motor itself but there is a relay under the hood take the motor out and make sure it is not full of leaves and test it but you should be able to get a used one at a salvage yard at lot cheaper then a dealership