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I have a 2006 SE-R, 115K Miles, Im the original owner. Never had a problem out of the car until recently. It started with the car overheating when the A/C running and sitting still (parking lot, red light, etc.). My husband is a mechanic for a local ford dealer, so car repairs are no problem for us. We immediately thought it was the relays. Replaced all those, same problem. Replaced the fan assembly and the radiator (did both just cause they were already out...so why not?)...still had the same problem. We also replaced the thermostat, temp sensor, hoses, all new coolant....anything we could think of.....SAME PROBLEM. After reading some other posts on here, we decided to swap out the IPDM (fuse/relay box) with another 06 Altima. Same problem.

Im absolutely at a loss here. Whats causing the car to overheat? The fans are working just fine, kicking in and out when they should. What we are noticing is that the car is idling fast. For example, normal idle for a hot engine should be about 700 rpms. Once my engine warms up, it will go from 700 rpms to somewhere between 1100-1200 rpms while sitting at a red light in gear. Obviously the transmission (its an automatic) jerks quite a bit when putting the car in gear at the high idle. The car could literally get up to 30mph without ever touching the gas pedal. When you cut the engine off and let the car sit for a bit, when you restart the RPMs will be back to normal. Then shortly after driving, it idles high again.

When the engine is idling fast, that's when most of the overheating problems are taking place. It started as just when the AC is on, but now its practically all the time if the car is sitting and running.

Any idea whats going on? Also want to say, ive done the idle relearn procedure. Did nothing to help the problem. Im almost convinced its something electrical going on....but not a clue what it could be.

Another thing ive noticed, when the AC is on,....the secondary fan kicks on and off while the compressor cycles. Is this normal for the Altima? Ive had several mechanics say that's not normal and any car ive ever owned before the fan ran non stop if the AC was on.
 

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Sounds like your water pump is failing. All other bases have been covered. Unless a Nissan tech is doing the water pump, the job can be difficult if you have to remove the timing cover. It can be replaced without removing the timing cover but you MUST know the correct procedure or you will end up opening the timing cover anyway to retrieve the dropped bolt or to reset the timing chain.
 
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