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Thank you and I appreciate all the responses as this is a sticky and none stop circulated conversation with running temps, but after this I'm concluding my car is running good and I wouldn't mind sharing the knowledge to help others with the headache they may be dealing with or atleast think...

@joegr again I really appreciate your input on my issues it means a lot as I am lost, so to break this down for me, is it abnormal or normal that my car wants to run hotter with both heater and ac off? Do you think I am having an issue here or am I chasing down a problem that doesn't exist here...

I didn't boil the thermostat.. Maybe I should get another to test it out. I got it brand new though and all Motorcraft when I swapped literally everything over. My whole cooling system is new besides the three hoses to the passenger side that go to dccv and aux pump. Also I don't think it shows...

So you're saying this all sounds normal @joegr? I am just going off of what people swear by and that's the Temps running from 190 - 205? I was just very concerned that my car isn't cooling itself down properly without ac or heater on? With both off my Temps will never stay below 214? I don't...

@AmsterDutch do you know what your temps are when ac is off and driving?

@AmsterDutch my car doesn't go past 96 Celcius with ac on and it was 106 out today.. But ac off it runs hotter sitting around 214 F then 217 F then eventually 220 and I even got it to 225 226 idling revving at 2k rpms in driveway. Also this is after I used my airlift kit and had cooling system...

With my ac on or heater apparently Temps stay in the 190 to 205 range, the minute I turn either one off, my Temps slowly but surely climb up eventually getting to the 220 range with no fluctuation of going down? Sorry I have replaced water pump also, propellers on mine weren't gone from the...

OK sounds good I appreciate you and your knowledge with all this! I just did a little driving test and believe it or not the car was running at a steady 205 203 the whole time but my ac was never turned off, turned the ac off and kept driving and the car jumped up to 217 and never cooled back...

@joegr I have the workshop manual and followed it to the T and also the threads on cooling system replacement. My only other question is I'm in California where the temp outside today is 103°F... Would this mean my Ls should still be running at 190-205 range? Or is there room for higher Temps...

My car was empty of coolant for a few months do you think any sensor like coolant temp sensor by oil filter could go bad? Or cylinder head temp sensor? Just wondering since it was empty of coolant for a bit while I procrastinated on the overhaul

Ya I have all oem parts, and I will be trying a new thermostat to see if that's the issue then. I'm going to buy it from Ford parts giant this time, I believe the first one was from rock auto

Looking for some suggestions. Cooling system is brand new on my 03 3.9 Gen 2, both radiator hoses, radiator, thermostat, housing assembly, all gaskets, 94n99, hose under intake manifold, water pump, degas with new hoses, aux pump, dccv and both hoses from dccv to upper hose and aux to...

So, little update I was getting ready to do the black and mild (smoke test) trick and see what I can find out and was watching a few more videos on shooting smoke up the exhaust.. Long story short I got hungry and wanted tk go grab some food, car runs fine so I'm mid driving right now, plugged...

Watched a few videos on doing a smoke test, do you have a suggestion where to start this at? Throttle body with a glove or a different vaccum line?

OK I'll try the smoke test and see where I can get, I also forgot to mention I am on a tank of older gas as the car was sitting for a little bit so not sure if this could be somehow saying its running lean? (6month old gas) trying to cycle through it right now, after our messages I inspected...

Well I replaced gasket inbetween throttle body and Intake manifold with felpro replacement (Motorcraft doesn't make it) and I have metal gasket that goes between the actual throttle body itself. I can just go ahead and swap that one out to get it out of the way. Besides those two gaskets, I...

This is where I've pinpointed the only whistle I hear and it's faint..

Which exact hoses? But yes I have I sprayed chemtool on all of everything, I had intake manifold out so really gave me some time to inspect everything. I broke pcv hose going from passenger valve cover to throttle body and replaced it. At this point I was even considering swapping out the red...

Here is a photo of the slight water drop I saw, I figured it wouldn't be anything jsut thought I'd mention it.

Hey everyone I'm new to the forums so I lag how to work this site very well, I've read thread after thread about this issue but couldnt find a definitive answer or what to do. I have a 03 3.9 very clean one owner before me 80k miles. I did full coolant system replacement, (everything) including...