Not sure what gives this just started... It's gotten real cold out here in NY. Drove my car for about an hour straight and the car never reached operating temp. In fact it stayed in the cold for a long period.
Turned car over this morning and again not warming up, and now I have a check engine light....

Any clues? I was thinking bad thermo, but it was replaced a year or so ago as well as the radiator..

 

Bad gauge?
When radiator was replaced--what coolant used?
Thermostat stuck open would be the first thing I'd check.
On the CEL--get a code.

 

Thermostat.

It doesn't matter if it was replaced a year ago, I've had some go bad in less than a week.

 

1) Coolant/overflow topped off?
2) After 15 min drive, open hood. Safely check for radiator and top hose heat. if no, suspect thermo stuck open or major air in system. if yes,
3) Suspect faulty coolant temp sender, which might trigger cel. get code.
Good Luck!

 

Went to Autozone on lunch, low antifreeze or bad thermo was the code it thru out. So yeah new thermo it is.