Hey Wb, You say you checked the pressure and its ok. Have you checked to see if the pressure is actually freon or just hot air..(this is from a personal experience with the same symptoms) Let some of the pressure off the system while it is running..(the low pressure valve) and if freon does not immediately come out.- Just hot air..let it bleed until freon comes out .. (mine was overcharged and I had to let out A LOT of air out of the system until freon started coming out).. try this and see if it helps.. ...mine is working fine..blowing cold air 24/7 after this .. with no other steps,,,
SOURCE: 2000 Nissan xterra
I have the same problem (my AC just quit and now I bathe in my own sweat on my way to work)....the mechanincs at The Tire Choice in Aventura, Florida, state that fixing the problems requires changing two "A/C Relay Switches" for about $60 a pop...I will give that a try in lieu of the $1500 charge of changing the car's computer.
SOURCE: 2004 nissan titan, shift lever
Hello gary823
Thank you for choosing fixya.com.
First things first: I suggest taking your truck to a mechanic or an auto parts store that can do a diagnostics test done. If any fuses or relays are blown, this test should bring up any codes that would indicate any type of malfunctions.
The shift lever being locked: In newer vechicles, the brake pedel, as you know must be pressed in order for the transmission to be put into gear. There should be a sensor on the transmission that runs in cahoots with the brakes. This sensor tells the computer what gear the transmission is in. It is very possible that at the last time you put the vehicle in Park, that the switch had it's final moment of ability. If the sensor is in fact useless, it may be the reason the transmission is locked into Park. It may be the reason why the brake lights aren't working; and why the brake lights fuse is blowing. Also, check all relays, (can be tested with a fuse tester) and make sure all relays are good as well. Make sure also that the light sockets for the brake lights, tail lights, back up lights, and front running and blinker lights are in good condition. One faulty socket, can cause more than one bulb to blow, or cause fuses and relays to blow as well. Follow the wiring for the brake lights for as far as you can to ensure there is no damage (melted, broken, etc.). This could also affect fuses. This truck I see is barely 5 years old, but you'd be surprised how quickly parts and wiring and such will go bad, or wear out and/or just quit working.
If the transmission sensor is not the problem, and all fuses and relays are good. tranny fluid is full, check the linkage under the truck. It may be jammed somehow, or stuck. On the transmission, where the lever inserts, there is a seal - inside that seal, there is like a gear that the lever pushes in order to shift from gear to gear etc. You may need to have that checked out to make sure it's not broken inside. If your fluid is low, or empty, you may have froze up your transmission, however, you most likely would have been seeing large amounts of fluid in the frequent places you park. Another think to check is your differentials. Make sure the fluid is full in each, as well as the seals not leaking. The seal sits just inside the inner most part of the pumpkin (differential ball) where the yoke is inserted. Maybe you have just locked up the rear driveline. Check the seal on the front end of the driveline as well, (goes into the rear of the transmission (yoke). Check your U-Joints as well, making sure they are intact, tight. It may be a good idea to have them replaced if they look supsicous in any way.
These are all the things I can think of that would make your truck be stuck in park, and make your lights not work, and blow fuses.
I sincerely hope this information is useful and aides in the successful repair of your truck. Thank you again for choosing fixya.com. Please let me know if I can be of further assistance, or if you have any more questions or concerns (comments).
Thank you again,
carsandcomps
Guru, fixya.com
Oregon
SOURCE: Truck AC Blowing hot air. Compressor is turning
defective air temperature control blend door motor.
SOURCE: Car AC stopped blowing cold, compressor turns on, Freon at 45
check the thermo control amp, it is a sensor that keeps the evaporator from freezing. I had that problem on my 2000, it's a common nissan problem, google nissan ac problems.
SOURCE: 2005 nissan altima heater blows cold air when
Check your coolant level. If it is low, what you describe will happen. Water pump works faster as rpm's increase, managing to get hot coolant to heater core (highway speeds). At idle, pump is not working fast enough to get the coolant to the heater core.
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