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Discussion Starter · #1 ·
ok ill give you the low down, my 05 titan is overheating but it makes no sense, i have a radiator in it that is about 6 months old and a couple weeks ago i was going up a trail at low speed, which makes sense because there was no air flow to the radiator, but out of nowhere the temp gauge spiked from normal operating temp, to off the chart within a second, and whats weird is that it was freezing cold, there was snow... and had the heater cranked the whole time. havent had any problems since until today. driving home from work in a lot of traffic, makes sense again no air flow to the radiator and it does the same thing. so i turn off my ac and once i give it a little bit of gas it drops just as fast as it climbs, in less than a second. so once i get going about 70 on the freeway, the temp gauge is all over the place hot normal hot normal hot normal...everytime it goes up or down it does it extremley fast. i have a thought that it is one of two things, either a bad temp gauge, even tho when i open the hood it feels really hot, OR a bad thermostat, im leaning towards the thermostat. what sounds like the culprit?
 

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Definitely the thermostat
 

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Discussion Starter · #4 ·
alright so i changed the thermostat the day that i posted this thread, 2 weeks ago and she has been doing fine until yesterday, started overheating again. same deal, it spikes hot, then spikes back to normal. it almost instantly overheats once i turn on the a/c. ive noticed that the electric fan in the front doesnt seem to be working, but the belt driven fan does, however i dont think that it would make that big of a difference.

one other odd thing that i have noticed is my oil pressure has been on the fritz as well. if its in P or N oil pressure is a tad bit low, but nothing to be too concerned about, but once i put it into drive, it drops bad almost a quarter of the guage...

any ideas anybody, i am completely stumped and dont wanna spend the 120 bucks to have it looked it...is it possible that my new thermostat went out in two weeks and i just need a new one again
 

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Fan clutch is a goner.
How many miles on the truck?

Use a different brand of oil filter next time.
 

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Discussion Starter · #6 ·
the fan clutch huh? im not really inclined on cooling systems but how would that cause it to overheat? its got 140k

and the oil filter is a nissan oil filter from the dealer
 

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There is no way you can go from a normal temp to overheating in less than a second as the OP states is happening. I'm thinking Temp Sending unit is bad. Also either use the Genuine Nissan oil filer, WIX, or Mobil 1 filters seem to be a popular choice as well.
 

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Discussion Starter · #8 ·
that was one of my initial thoughts that it was a temp sensor but when i open the hood the motor is actually pretty damn hot, and i have no clue where the temp sensors are and how i would go about testing them
 

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Then it sounds like you need to take it to someone that does.....
 

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OK...Disclaimer first...This is not a nissan specific response...

I had the same thing happen on a honda accord 4-5 years ago. There was a crack in the pipe between the thermostat housing and the water pump, causing air in the cooling system. When I turned onto an on ramp, the temperature sensor was no longer immersed in water, it was surrounded by steam. The temp gauge went from rock steady normal to pegged in less than a second.

Moral of the story... If I had to guess, you have air in your cooling system, and in certain situations, the temp sensor is no longer covered by coolant. This will also allow uneven temps inside your motor and screw you pretty quick. I wouldn't drive it until I resolved the issue, or you may end up warping a head.
 

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Discussion Starter · #11 ·
k, so after takin it apart today and trying to troubleshoot it there are a few more symptoms to report. i checked the fan clutch, no play, still really tight and no fluid leaking as i have read it does sometimes. checked the shaft on the water pump tight, no play. but i opened the radiator cap while it was running to check the flow. there was none, i waited until it warmed up when the thermostat should have opened but you can see where it would try and suck it down, you could hear the rpms drop at this point, then it would come right back up and it would do this over and over again....to me i would think i bought a bad thermostat...? can you run the titan without a thermostat without any issues?
 

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Discussion Starter · #12 ·
thermostat is outta the question too...just tested it in boiling water..its good...
 

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I still think the problem is the temp sensor/sending unit......
 

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You sure you got all the air out of your system when you installed the new radiator. I put in a Stillen and took a week to get all the air out.
 

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Discussion Starter · #15 ·
well i put the new radiator in about 6 months ago and had no issues, then it started all this nonsense outta no where...changed the thermostat a few weeks ago and no problems now the problems are back...my dad(which used to be a mechanic) thinks its a cracked head/head gasket because im getting alot of bubbles in my coolant
 

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Are you getting coolant in the engine oil??
 

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Discussion Starter · #17 ·
havent checked that out yet...but ive heard that it wont happen everytime
 

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well i put the new radiator in about 6 months ago and had no issues, then it started all this nonsense outta no where...changed the thermostat a few weeks ago and no problems now the problems are back...my dad(which used to be a mechanic) thinks its a cracked head/head gasket because im getting alot of bubbles in my coolant
A bad head gasket or warped head would manifest itself with either coolant in your oil which causes a lot of steam out you tail pipe on start up or oil in your coolant, or both. Bubbles? Hmmm
 

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Discussion Starter · #19 ·
well finally got it into a shop today, turns out it was the most simple thing in the world...bad radiator cap hahahahaha
 

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Which cap, the one on the radiator or the one on the overflow? Hopefully they put the right cap on it if it was the radiator one.
 
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