Problem with a/c 0n 2004 nissan sentra

check wiring on fan and switch if you had them off. Sounds like you have ground wire mixed up with power wire.

Check to see if the radiator fan switch if working properly.

2002 Nissan Sentra Serpentine Belt 2.5 litre

Go to the following web site (copy and post the web address to your browser)

http://www.daycoproducts.com/daycoweb.nsf/cf652a4feb630ad0862571a4005ae40c/a866a821123f887c862571a5006988df!OpenDocument

There are 2 PDF documents above the photo. The first gives you the Routing guide for the vehicle/engine - 6-18 0n page 98 and the second document ( Illustration PDF) gives you the belt routing diagram for 6-18.

Hope this gives you what you need.
Cheers
Sean
Voluntary contributor.

Sound like the fan needs to be replaced. If the fan is not flowing enough air through the condensor the heated generated by the A/C system can not be disapated, which causes the pressure in the A/C system to rise, and the computer will shut the A/C system down to prevent damage to the A/C compressor. When you are moving down the road, there is enough air flowing through the condensor so that the pressure stays within a normal range and the computer will allow the A/C system to continue running. Your local Nissan dealer can test the fan system to see if the fan is functioning normally.

condensor fan may nopt be operating if the condensor temp gets up there the compressor will not run

I'm not sure about the sentra, but I know that in my 1998 Eclipse, which has a dual cooling fan, one of the fans is a backup. You might want to make sure of that before you go buying fuses and relays.

On a Fixed Orfice Tube system (FOT) the compressor cycles on and off because there is no other way to regulate the refrigerant. On a Thermal Expansion Valve system (which is what Nissan uses) the compressor stay on because the expansion valve regulates the refrigerant. It is not normal for your compressor to cycle on and off. Check your refrigerant level.

possibilities include: fan clutch, water pump going out, missing fan shroud or baffles in front end, clogged radiator fins or a/c condensor may need cleaned. Possibly stuck thermostat, low coolant level , and this can be caused by faulty radiator cap. Hope this helps!

Replace the blinker. It is a small round cylinder under your dash. A common cause of this is that there is a burntout bulb on the back . Not the one thats blinking. You will see the signal indicator arrow blink really fast.If not then it is the blinker.

The flasher is in the middle of the dash up behind the audio unit. Why are you replacing this part, I have never seen one of these fail on a Sentra.