Engine overheating?

I went to Autozone, there are no codes displayed, everything seems to be okay. After driving for a while, with the engine hot, I checked under the hood, and noted the following: the coolant in the reservoir is at the proper level, but cold. The upper radiator hose is hot, but the lower one is cold. Very little heat coming out of the vents with the heat turned all the way up. The temp gauge spikes up close to the top but the car doesn't seem to be overheating. The gauge fluctuates up and down from center to top slowly but frequently.

Any ideas?

Thanks

I checked everything. It was none of the above. Took it to a mechanic, he simply purged the air out of the cooling system and everything is fine.

On warm days (usually over eighty degrees) my engine will begin to overheat when I am sitting in traffic. If I turn off the A/C the temperature will stabilize and I can keep within the operating range but it is on the high end of the scale. If I turn the A/C back on the temperature will begin to rise. I do not notice this as much on the open highway but if the outside temperature is up over ninety degrees, the engine temperature will push up to the high side of the scale even in highway driving. Turning off the A/C is the only way to keep within the operating range. When I am sitting in traffic at a red light, I can here the fans kick on so I am pretty sure the fans are operating when called for. I have had the coolant checked at Infiniti dealer and they are telling me it checks okay. Would the thermostat be the problem?

Did you ever fix it? I am having the same exact problem?

Thanks

I have the same problem with my Infiniti. It gets overheating went I turn the A/C on. Why?

My car started intermittently overheating. On three occassions now, the temperature gauge has gone up to within a few tick marks of the first heavy hot line. (Half way from center, to almost touching).

I do not see exhaust in the coolent resorvoir

I do not see white smoke from the tail pipe

Keeping the car in motion keeps it cool where it is supposed to be.

When the temp gauge goes up, the AC blows warm air

When I see the gauge go up, I turn off the car for a few moments, then the next time I start it, it is working fine.

This occurs when the outside temperature gauge in the car reads 92 or hotter.

When engine temperature gauge is showing the correct temperature, the AC is cooling great and the AC fans are blowing hard

When the engine temperature gauge is showing hot, and the AC is blowing warm or hot air, then the AC fans are running slower.

There is no apparent loss of coolant

I do notice an extremely faint smell sometimes of hot coolant, but it is so faint, I am not sure of it. I do not see any measurable loss from the coolant resorvoir or any leak marks on the engine or in the exhaust.

Special note: my ac is on automatic because the control panel is damaged and needs to be replaced. As a consequence the control buttons do not work. (They want 2900 dollars to replace that control panel)

Thanks for getting back to me so quickly. I assume by cooling fan you mean the fan in front of the radiator. Is that correct?

Ok, thanks for clarifying that.

I will watch it over the next couple of days. It may take a day or two before it heats up again. I will watch it while he air is working, and then when it heats up again, take a peek and give you the results.

I appreciate your patience.

It overheats head gasket not cracked

Not long I check the oil no sign of head gasket blown

Havent drove it over heated just enough to know it gonna over heat
I park it home soon as.I bleed the radiator and it started up but didnt take long for it to start over heating also I only filled to the with water to bleed air