A.c. blows hot air,compressor and radiator fan kick on and off repeatedly while controls are set to max. a.c. did have blown 20a fuse that was for radiator fan (Lo). Radiator fan before fuse replacement would only kick on periodically now with new fuse kicks on every time compressor does, which like stated before is repeatedly @ 1 to 2 second intervals with control set to max a.c. Also when first noticed this problem about 2 weeks ago i thoght it might need some R-12 even though i have had the vehicle about a year now. after checking i did in fact need a shot of R-12 which after being administered made the compressor kick on. This did not fix my problem so i started looking at the fuses. A
ny input would be greatly appreciated.
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Re: 2001 nissan quest,air conditioning
I hope you are adding R134a & not R-12. I think you are just confusing them.
our problem is a leak in your a/c system somewhere. Your a/c should cycle about 4 times/minute. When you add refrigerant, you are refilling the system and making it work again. The system only holds about 3 cans of refrigerant. If you are doing yourself, get a fill hose with a gauge on it so you can see if it's "ok" low or high pressure.
The leak will probably require pro ehlp.
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If your a/c compressor kicks on and your manifold gauges show proper hi/lo readings then I would inspect the blend door. The blend door is a motor that moves back and forth when u set the temp for hot or cold . In your case, it may be stuck in the same position. The blend door is located in the dash, usually behind the glove box or in that general area.
I hope you are able to fix your problem.
you say it will blow cold and hot air for only a few minutes. You don't say but I assume you mean will blow cold a few min. when turned on AC max , blow hot only a few min. when turned to heater hot. Assuming thats the situation and you say AC charged and shows good on the low side -you should charge the AC to a full charge on the low side will cause problems with the AC air compressor kicking on and off. I suggest while the engine is running and turned to AC cold max watch the AC air compressor clutch to see if it does indeed kick on and off if so charge completely. As far as the heater make certain you coolant is all the way to the top and the best way to do this is when engine is completely cold remove radiator cap and fill completely and completely close cap then fill overflow container just to the cold level. That should fix your problem.
It sounds like one of two things could be causing your concern. One... your coolant level is low and not circulating through the heater core which could possibly have air trapped in it. Two.. your mix door may not be operating properly. Sounds like the second one to me.
Check your overflow tank to see if it has coolant in it. This vehicle has rear air meaning coolant has to travel to the rear to heat the compartment. Air will have to be purged from the coolant system. WIth the engine cold remove the radiator cap and check the level in the radiator. If there is no coolant present there is a possibility that you have a leak somewhere in the system and it will need to be pressure checked.
Whether you have AUTO or MANUAL air the mix door has a motor mounted on it. If that motor does not work you will experience the concern that you have. Turn the knob (on manual models) from hot to cool to hot and listen for air sound change. On AUTO models change the temperature from 90 to 60 to 90 (make sure you are in manual mode so the mode doors don't change). There is a slight restriction on heat because the air has to travel through the heater core
sounds like a damper door in the front not working properly, these are actuated by the front temp control, the door is operated by either a manual cable, and electric actuator, or vacuum. I hope this helps you zero in on your problem. Merry Christmas
I know this is late and hopefully you have this fixed, but the problem is probably the air diverter door control. There are 2 doors, 1 front, 1 rear (middle) and they are adjusted by a single control to balance the temp front and back based on the controls. If this goes out, you either are stuck with hot air up front/cold air in back or vice versa. You can try manually moving the doors to see if they are stuck (in the duct work) or test the actual control circuit. Check your tech manual for how to do it.