2003 GMC Envoy Oil Pressure up and water gauge lower

2003 GMC ENVOY
92,301 MILES • 6 CYL • 2WD • AUTOMATIC
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CMDPP
  • MEMBER
  • 1 POST
Hi
Help !
A week ago I smelled some burning and noticed oil pressure was past its' usual "straight up" normal.
Added oil and smell disappearred.
Oil pressure only slightly lower. It goes up with the speed, back to normal at idle.
And now, noticed the water guage is running lower.
The water pump was replaced at 71k miles.
What is happening?
cmdpp
Aug 4, 2009 at 7:55 PM
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RASMATAZ
  • CAR REPAIR CONTRIBUTOR
  • 75,992 POSTS
Inspect and test the coolant temperature sensor resistances see below and wiring or the thermostat is stuck open.


https://images.2carpros.com/forum/automotive_pictures/12900_CTS_values_5.jpg

Aug 4, 2009 at 8:44 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.