I have a Nissan altima 2005, I just had the radiator changed yesterday. Now when I go to drive it this morning it starts over heating as soon as I press the gas. I have to pull over let it cool down in order to drive again. What can it be? I've spent to much money on the radiator I can't afford much more. Please help!!

I suspect the cooling system needs to be "burped" as it has air in the system. Park the car facing up hill, the steeper the better and idle the car with the radiator cap off (take it off when the car is cool) and let the car fully warm up with the heater on. Top off the coolant and you should be good.

Thank you so very much!! I will definitely take a look at that.

Oh I forgot to mention, it also misfires the engine shakes but was doing so prior to it over heating.

Check your thermostat, it might have just stopped working, check for leaks in the radiator hoses and radiator its self.

mine does the same thing I just bought it from a park and sell type dealer and it ran great during test drive speed up great slowed down great everything then as I was driving it home (about 30 minutes into an hour trip) it started slowly decelerating, I was going 75 then it wouldn't go over 55 and I was like shit I'll look at it after I get home then 5 minutes later it was 40mph then 20 then 10 I opened the hood and everything was crazy HOT but fluid levels were good so I let it cool down a bit and was able to drive it home any ideas what to do if seen every thing from I need a new transmission to I need to replace a sensor

The 02 - 06 Nissan Altima 2.5 is well known for head gasket leaks. I would start there get a head gasket leak test performed before doing anything else