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AutoTech08, Workshop owner
Category: Nissan
Satisfied Customers: 973
Experience:  Diploma in Automotive Engineering, 30 years working experience.
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My 2000 Nissan Frontier air conditioner works intermitently

Customer Question

I brought my truck to a tire shop who also handled air conditioner problems. My air conditioner had stopped working. They said it was low on Freon and vacuumed and filled the system $100. A month latter it quit working
     I brought it back and they refilled the system and injected dye. A week latter it quit working $100.
     I brought it back and they said a hose was leaking and they had the hose rebuilt and refilled the system $125.
     A week latter maybe less it started to work intermittent. I brought it back and they said they could not find a leak and didn’t know.
     I brought it to a Nissan dealer and told them how it will work sometimes blowing cold air and just quit and maybe start back up latter with no real specific pattern to stopping and starting. They said it was low on Freon by .3 lbs and found a leak at the scheroder valve fix the leak and recharged the system $100—I wasn’t even out of their lot and it quit working and started to work hours later
Submitted: 8 years ago.
Category: Nissan
Expert:  Dj replied 8 years ago.



It still has a leak that they haven't detected yet. The system should still have dye in it. The dye fluoresces or lights up with Ultra Violet light. You can buy a UV light on Ebay for less than ten bucks. Make certain that you get protective glasses because the UV light can damage your eyes.


You should be able to see the leak by following all of the AC components with the light. The dye will look like radioactive snot. It will be easy to see with the UV light.


The first place I would look is the AC drain on the right underside of the car right below where the passenger's feet would be. This drain takes the condensation away from the evaporator core, which is inside the car behind the glove box. You won't see the actual leak but you will see the results of the leak coming out of the AC drain.


Most techs forget to look here. I expect they looked at all the easy places but forgot this one. If it's leaking there, it's an expensive repair. I think one of these shops owes you because you paid to have the system diagosed and they didn't do a thorough job.


Thank you in advance for accepting my answer. If you feel that my response isn't helpful, please let me know and I will release your question back into the list.



Customer: replied 8 years ago.
I find it hard to believe this once working air conditioner system would now have a third leak 1. was the hose 2. the schroeder valve 3. not found yet -- hard to believe but not impossible--I've been doing some reading about a thermo control amplifier not working correctly--I question how low the system really was because sometimes the air would work for a hour then quit. It is so intermitent that I can not pin point a cycle how it just stops and starts
Expert:  Dj replied 8 years ago.



I don't think any of the shops have actually found the main leak leak. They might have found a very minor leak or maybe no leak at all but they still replaced a part.


If they add freon and it works for a while it still has a leak.


I'm sorry that you feel that my answer isn't helpful. I will release your question.



Expert:  AutoTech08 replied 8 years ago.


Hi there,


The last repair at the Nissan dealership, low freon by 0.3 lbs and subsequent problem happening immediately indicates fault might be electrical.


When the AC fails, check if the compressor and condenser cooling fans are working. It could be due to a faulty relay, failing compressor clutch or electrical controls and testing would have to be carried out when the problem happens.