Runs cooler with a/c on?

[rady2000]

So my trucks EOT and ECT are about 215*. Today I drove to work with the a/c on temps got up to 190* and never went any higher. Do you guys have any idea why it would run cooler with the a/c on?

[jtk27]

If your ECT is getting to 215, it sounds like you need a new thermostat. 190 is where it should be. Could've been the thermostat came unstuck or the fan engaged more due to a/c but nonetheless 215 is too hot.

[rady2000]

Originally Posted by jtk27

If your ECT is getting to 215, it sounds like you need a new thermostat. 190 is where it should be. Could've been the thermostat came unstuck or the fan engaged more due to a/c but nonetheless 215 is too hot.

Well I'm hoping it's something simple like that. I'll be doing a flush and adding ELC coolant and a new thermostat this weekend.