Coolant sensor/ possible cooling issue/code P1299

[bedrck46]

Keep the forum posted

 

[bar422]

Will do....

 

[bar422]

I drove it 71 miles today on the interstate at 70-75 mph and it didn't act up at all........I think the problem is cured.

 

[wcm7823]

im having exact same issues...code p1299...ive changed tstat, cylinder head temp sensor, havent changed water pump yet...2003 expy xlt 4x4 5.4l