I just did an entire coolant flush, every bit of it. Took the radiator hoses off and the radiator drain, got every bit of coolant out.. Put everything back together, filled my truck up with 50/50 (coolant and distilled water). Left the cap off and turned the truck on and let it sit in idle. I let it do this for 30 minutes and the temperature gauge won't go past 1/4... So I went driving around for about 30 minutes, and still the temperature gauge stays at 1/4, when it should be at 2/4... Not sure what's going on. I did exactly 50/50, and followed everything to the book on doing a coolant change. No idea why my gauge won't go to normal temp... Any help would be greatly appreciated, I'm at a loss right now

Edit: Forgot to mention, I did blast the heater while doing this. Heat seams to work fine also

 

Did you replace the thermostat?

 

No didn't do that, My truck's temperature was running perfectly fine before doing this coolant change.

 

Did you take it out to do the flush? And if so did you put it back in?

it could also have some gunk dislodged from the flush holding it open.

 

Good call, I actually didn't take it out!! This makes so much sense, I'm going to go out there and drain it now, and clean off the thermostat. Sense my coolant is brand spanking new, I'll just poor it back in. Anyways, going to do that now, thanks!

Edit: Will keep you updated

 

Update: Nope, I took the thermostat out and it is in the closed position. So it's not stuck open Took boiling water to it and it opens and closes just fine

 

Okay edit: scratch everything I just said. I have no idea why my truck is running cool... I'll try and get my hands on a scan tool. I went to Orelly's and their tool only works if your check engine light is on...

 

Okay, well just updating everyone. After a couple days, the meter slowly went to normal operating temperature. Not sure why it slowly got better day after day but after a few days now its perfectly fine... No idea why it wouldn't just do it at the start. But all is good now and I'm leaving it at that. haha.