Story: After a couple hour drive to the city in my 2007 Maxima I stopped at a red light, at which point the engine immediately started smoking like an old time villain and the engine temperature shot up to redline less then a minute later. I Refilled the very low cooling fluid and I thought that was the end of it but next long drive I took the same thing happened.



After some checking I realized the radiator fans where not going on and I proceeded to do the following:

1. Ran wires to the fan nearest to the battery and it ran, so the fans seem to be ok.
2. Visually inspected the fuse they seemed fine.
3. Tested each of the relay to see if they "click" which they do. ( I don't have a multi meter so that all I could do)
4. Pulled out all three relay and "jumped" the socket, by that I mean I placed wires directly into the socket and and ran the car with the heat/ac on full blast and the fans did not trigger- Plus I ran the car in test mode where the last check is the fans and they did not trigger.

Here are the things I am thinking but I am running out of ideas:

1. People said to check the cooling fan switch but I am not sure that this car has cooling fan switch and even if it did wouldn't the relays be triggered when the heat was on full blast or when I ran the self diagnostic mode?
2. Replace the whole IPDM/computer board
3. I guess start checking wires individually? (and I guess I need to buy a multi meter )

PS Not sure if the other issues with this car are relevant but they might be, lets see what you guys think.

1. The AC has never worked on this car a mechanic took a quick look and said that the compressor is no good. I brought another one but have not put it in yet. But I am not convinced that is the issue.
2. The car sometimes takes a bunch of key turns to start, you can hear the relay but it doesn't even crank. When it does crank it always starts. I am not sure what this problem is either, this has been this way for 7 months and I always thought a bad starter just dies.

It would be neat to all be related and switching the IPDM would solve all the issues.

Thanks for any and all suggestions