Joined
·
14 Posts
OK, heres another overheating post.... I have read hundreds of posts and reply concerning this issue on my 04' but noothing has worked so I'm posting exactly what mine is doing in hopes that SOMEBODY can help!
Ok, I had my truck idling in the driveway one afternoon and came out of the house and it was running hot.... Hot as in the needle was at the 3/4 mark before all the way hot.
So, I take off in an attempt to cool it down with more airflow through the radiator. and it cools down rather quickly and I don't hear the radiator fan increase speede so I suspect the clutch is bad.... So i go to Nissan and buy the clutch, and the thermostat and replace them both. Runs good, no problems.... sitting still after about 5 mins and we're back hot again...OK..... so now I go and replace the radiator cap, and overflow cap and extensively attempt to bleed the system thinking that I may have air in the system.... ......ok.... running and after 10 mins we're hot but drive it and the temps come down after turning on the heater. (i forgot to say that I had the gheater on while refilling the system). so, heres what has taken place in short order:
New radiator (not from this but it was cracked last year) so iI replaced it.
Replaced fan clutch last week and bought another one yesterday.
Replaced thermostat twice
Replaced water pump.
Replaced radiator cap
Replaced overflow cap
Dealer did the condenser fan recall and it's coming on perfectly.
Re-Bleed the system several times including jacking the front end up
I removed the radiator yesterday thinking maybe it was clogged and took it to the shop and it's flowing perfectly.
Now, lastnight I turned the heater on and removed the line from the heater core going back to the engine and it's barely tricking out of that line.... Now, i'm thinking it should be pouring out of this line... especially after the engine is warmed and the thermo is open... RIGHT????? The line before the heater valve is hot and the one after the heater valve is hot so It's flowing..... but why isnt it pouring out of the heater core return?
Also, I'm thinking that If the heater valve was bad and the heater is not on then the core isn't even in the circulation of coolant so why is my truck running hot? Even single thing in the coolant cycle has been replaced...
Now, I am getting the friggin water on the floor with the A/C on and I know that is the drain hose situation and I"ll get to that later. I do notice that the water soaked carpet is hot but I think thats from the fact that the exhaust is under the passenger side floorboard and I have checked for the presence of coolant, thinking that maybe my heater core is bad and allowing air into the system but that's ok too...
Funny thing is, I have a 04' Infiniti QX56 which has the exact same system and engine and I have changed the thermo and radiator in it and have had no problems! but I notice that I don't hear my thermostatic fan like I use to in the titan as I hear in the QX56, but I changed it twice in the Titan thinking that I had a bad one.... but same issue.... I don't see any woobling or anything.
I'm a mechanic and STUMPED fellas! Please Help!
Ok, I had my truck idling in the driveway one afternoon and came out of the house and it was running hot.... Hot as in the needle was at the 3/4 mark before all the way hot.
So, I take off in an attempt to cool it down with more airflow through the radiator. and it cools down rather quickly and I don't hear the radiator fan increase speede so I suspect the clutch is bad.... So i go to Nissan and buy the clutch, and the thermostat and replace them both. Runs good, no problems.... sitting still after about 5 mins and we're back hot again...OK..... so now I go and replace the radiator cap, and overflow cap and extensively attempt to bleed the system thinking that I may have air in the system.... ......ok.... running and after 10 mins we're hot but drive it and the temps come down after turning on the heater. (i forgot to say that I had the gheater on while refilling the system). so, heres what has taken place in short order:
New radiator (not from this but it was cracked last year) so iI replaced it.
Replaced fan clutch last week and bought another one yesterday.
Replaced thermostat twice
Replaced water pump.
Replaced radiator cap
Replaced overflow cap
Dealer did the condenser fan recall and it's coming on perfectly.
Re-Bleed the system several times including jacking the front end up
I removed the radiator yesterday thinking maybe it was clogged and took it to the shop and it's flowing perfectly.
Now, lastnight I turned the heater on and removed the line from the heater core going back to the engine and it's barely tricking out of that line.... Now, i'm thinking it should be pouring out of this line... especially after the engine is warmed and the thermo is open... RIGHT????? The line before the heater valve is hot and the one after the heater valve is hot so It's flowing..... but why isnt it pouring out of the heater core return?
Also, I'm thinking that If the heater valve was bad and the heater is not on then the core isn't even in the circulation of coolant so why is my truck running hot? Even single thing in the coolant cycle has been replaced...
Now, I am getting the friggin water on the floor with the A/C on and I know that is the drain hose situation and I"ll get to that later. I do notice that the water soaked carpet is hot but I think thats from the fact that the exhaust is under the passenger side floorboard and I have checked for the presence of coolant, thinking that maybe my heater core is bad and allowing air into the system but that's ok too...
Funny thing is, I have a 04' Infiniti QX56 which has the exact same system and engine and I have changed the thermo and radiator in it and have had no problems! but I notice that I don't hear my thermostatic fan like I use to in the titan as I hear in the QX56, but I changed it twice in the Titan thinking that I had a bad one.... but same issue.... I don't see any woobling or anything.
I'm a mechanic and STUMPED fellas! Please Help!