So, in case you're not from where I'm from, Southern Ohio is having an EXTREMELY hot summer/autumn. It was 92 degrees today and humid. Anyway, I've discovered something, my 3.0 HATES hot muggy weather. I was sitting at a long red light today and happened to look at my cluster, and actually watched my temp gauge raise up to just before the red. I freaked, blasted the heat and revved the engine a bit to get the coolant flowing some. It took about 45 seconds to a minute once the light turned green for the temp to get back down into the normal range. What is the problem here? I was just sitting there, no A/C, no crazy driving conditions or anything. At night time when it cooler the problem goes away. Any help? Thanks

 

id replace coolant, hoses, and thermostat.

 

I just put in a new radiator about 3 months ago, so the coolant and hoses are fine. As far as the thermostat goes, as far as i know its factory.

 

try replacing it. that might help. also check your waterpump... doubt thats the issue, but you never know.

 

Happens all the time in the same condition? Fan clutch.

 

fan clutch also. might want to check the flux capacitor also, you know they produce a LOT of heat, since they gotta do all that nuclear work

 

cool whats the part number for a flux capacitor again??

 

uh... DEL19852201521885 i believe

 

DEL19852201521886 if you want the polished stainless steel verision...

 

true, good point corv

 

outside temp shouldn't matter, there's definitely something up.

Make sure all air bubbles are out of the system.

I moved recently here in FL, filled the runner with stuff and towed a 5k lb trailer full of crap probably 6-7 times in dead FL heat/humidity.

 

I had the same problem and it was 2 things that caused it for me :
Thermostat was sticking open and not letting coolant stay in Rad. long enough (like running w/o stat) .
And ,
The Radiator Cap was bad , it has a little one way poppet type valve in middle that allows the coolant to be returned to radiator when coolant/motor cools , it wasn't working so when it got hot coolant left and never came back which eventually led to the radiator being about a gallon low and the motor would get hot as well unless you revved it up a bit .
I had also already replaced radiator and coolant prior to this problem as well .