I own a 2005 nissan altima and when I come to a complete stop or I am in slow moving traffic(just above idle)there is no heat the heat returns when I get on the e-way.The fluid in the radiator is good and there is fluod in the resev. What could be the problem? thanks

could be a number of reasons for the problem
If you can comment again or reply stating exactly when the engine is over heating (conditions of driving , stopped at lights , slow moving traffic , fan hub or electric fans etc) then we may be able to pinpoint the fault.

If the oil level is low, or the oil pump is worn out, this can happen. It indicates a dropping of oil pressure either due to oil moving forward away from the sump (low oil), or reduction of pressure due to lower rpms (worn out pump).

Both are recommended at the same time.

Double check your cooling system. Make sure it's topped up and that all the pipes leading from the radiator heat up during normal use, if not, you need a new thermostat.

might be the CAM & CRANK SENSORS ! HAVE YOU CHANGED YOU AIR & FUEL FILTERS LATELY ? DO SO IF YOU HAVEN'T. DID YOUR SERVICE ENGINE SOON LIGHT COME ON ? IF SO, GO TO AN AUTOPARTS STORE, HAVE THEM PULL OUT ANY TROUBLE CODES,FROM ECM, IF IT SAYS CAM SENSOR, REPLACE THE CRANK SENSOR AT SAME TIME ! ALSO, THE OXYGEN SENSOR PLAYS AN IMPORTANT ROLE, YOU MIGHT REPLACE IT ASWELL . ALWAYS KEEP FILTERS NEW, OIL CHANGED EVERY 3000 MILES.

first thing i would try is a new fuel filter,,if that dosen't solve it,the best thing to do is get a scan to see which sensor might be going bad.

Thermostat goin out

Have you tried asking them to just flush the system, as well as reverse flush? Sometimes that will clean it out enough to get you where it needs to be for now. If not, I'd try that, at another shop, obviously, if for no other reason, a second opinion. Try one that specializes in radiators if there is one in your area. If no luck, and your handy at all, I can tell you what I did to clean core out a few times that worked pretty well for me, and only cost me about $20-$30, and a little time. Let me know if your up to it, but I'd gamble the cost of a flush, and my method, before I'd pay $100's of dollars for new core.

Dear Tajack73: Nissan had a voluntary recall campaign on the 2002,2005,2006 Altima's with the 2.5 litre engines It envolves reprogramming the ECM.
The campaign ID # RD0712 NHTSA #: 07V-527
2005 Altima Vin's 1N4AL11**5C 100003-957025
1N4AL11**5N 400000-934180

The symptom you have described fits the one they have describe in the bulletin. Check with Nissan and see if your car falls within the campaign. Let men know how you do.

Most likely solution is probably idle sensor.