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Trust me on this one: The only thing to do in a situation like this is Hook it Up to a Quality OVD2 Diagnostic Scanner, if you don't its just a guessing game as many things can cause this. Call a friend or family member who has a scanner and have it checked, or go to a local parr's store and pick up an inexpensive obd2 scanner- they plug into the diagnostic port under the dash on the driver side, this will tell you the source of the problem or at least point you in the right direction!

The fact that that you haven't lost coolant and your reservoir is full still is a good sign. Try these 2 things:

1.) Check the oil and see if it looks "milky" or a strange color that's not the typical color of engine oil. If it looks ok at first glance, Look carefully at the dipstick and see if the oil level appears to be over filled- you'll know because the dipstick will be showing that it's at a level above full. This indicates that water/coolant has gotten into your oil and you likely have a blown intake gasket, this is common on GM Trucks/SUVs with the 4.8L/5.3L/6.0L V8.

2.) When the engine is cold and hasn't been running for a while, pop the hood and then start it up, quickly look under the hood for any leaks- especially around the water pump S it may be the issue(and an easy fix), or perhaps a radiator/heater hose is busted/leaking(also an easy fix). Just look for any leaks, if you have a friend or family member around get them to help you look for leaks, use a bright flashlight(even if it's daytime) so you don't miss a small leak as they're not always as obvious to see as you'd think. IT's OK TO LET IT RUN FOR A FEW MINUTEA BUT ONLY 2-3 MINUTES AT MOST AS ANY MORE TIME WILL CAUSE THE ENGINE TO OVERHEAT AND THAT'LL MAKE MATTERS WORSE AND YOU COULD END UP WITH A HUGE REPAIR BILL FOR MAJOR ENGIE ISSUE(S) INSTEAD- 2-3 MINUTES IS OK BUT THE SHORTER THE BETTER, SO IF YOU SEE A LEAK FIND ITS SOURCE AND CUT THE ENGINE OFF IMMEDIATELY- DON'T LET IT RUN ANY LONGER FHAN ABSOLUTELY NECESSARY!

I just fixed this issue on a Tahoe like yours and it was the water pump, the last one I fixed was an intake gasket, more on all of this below.

Regarding the Gauge Issue: it sounds like your Temperature Sending Unit is Bad which is no big deal and not expensive- it simply communicates with your gauge to display the engine temperature.

The overheating could be a number of things but most likely is a blown intake gasket as the 4.8L/5.3L/6.0L V8 Engines In 1999-Up Full Size GM Trucks & SUV's are known for having this issue. I just fixed a friend's Tahoe with this issue, I've done it many times on these GM Vehicles- I just bought a Tahoe with the same issue.

Worst Case Scenario is a Head Gasket Blown(or both are) and your cylinder heads could be warped or cracked as we, but it's usually not so serious, especially if you didn't drive it or let it run very long at all after noticing the overheating issue.

Any good mechanic/technician can diagnose this easily by doing a few common tests like a compression test and a leak-down test of your cooling system, etc.

Don't let that information alarm you, it may not be a big deal at all and a simple fix like a bad water pump, replacing the temperature sending unit, intake gasket, or all of the above which isn't expensive or hard to do at home with some mechanical ability and hand tools, but don't attempt it if you don't have any experience doing things like this- if you have any mechanical experience and can follow instructions then your Tahoe and all vehicles with the 4.8/5.3/6.0 are way easier than most to do the various repairs I've mentioned above to!


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Chevrolet... | Answered on Apr 13, 2019


i have a 1987 vetee it did the same thing it happened to be the light dimmer switch might try that

1988 Chevrolet... | Answered on Apr 13, 2019


Valve Clearance Specifications Application
Specification
Metric
English
Cold
Intake
0.15 ± 0.02 mm
0.0059 ± 0.0008 in
Exhaust
0.32 ± 0.02 mm
0.0126 ± 0.0008 in
Hot
Intake
0.25 ± 0.02 mm
0.0098 ± 0.0008 in
Exhaust
0.42 ± 0.02 mm
0.0165 ± 0.0008 in

Chevrolet Cars &... | Answered on Apr 13, 2019


theres no valve its just a hose between the air intake duct and the valve cover [passenger side front top of valve cover ]

2007 Chevrolet... | Answered on Apr 13, 2019


My daughter used her Equinox to jump another vehicle, afterwards the steering was stiff and the service stabilitrack light was on. The 80 amp fuse (GM part number 2268-9708) was blown.

The real reason for the blown fuse was that she did not connect the jumper cables to the battery but rather across the 80 amp fuse. The cover over the fuse box has a red + sign on it and thus she thought it was the battery. The battery is harder to get to, as it has an electronics module mounted on top of the battery cover. The battery is immediately forward of the fuse box. I wonder how many others have blown the fuse because of incorrectly connected jumper cables.....

2007 Chevrolet... | Answered on Apr 12, 2019


Hi my bakkie is wetting the plugs with patrol on a Opel corsa 1.4 please help me

Chevrolet Cars &... | Answered on Apr 12, 2019


There are many engines available in this truck, pick one, need cubic inches.

Chevrolet Cars &... | Answered on Apr 10, 2019


this could relate to the OBD code P0672 , which is for #2 glow plug , is your vehicle a diesel ?if not i can only suggest giving a Chevvy dealer a ring and ask them ,as must be a chevvy based code for the own diagnostic equipment

2012 Chevrolet... | Answered on Apr 10, 2019


I see no mention of you scanning the Powertrain control module for fault codes, do that 1ST

Chevrolet... | Answered on Apr 10, 2019


Google

year make model replace CV shaft

Then look at the video tab. See the link

https://www.google.com/search?q=%E2%80%8Byear+make+model+replace+CV+shaft

Chevrolet HHR... | Answered on Apr 09, 2019


Chevvyspark 2010- radio working but not the display. Does anyone know what this could be please? TIA

2012 Chevrolet... | Answered on Apr 09, 2019


You need to replace your halo around your ignition switch. GM sells a kit that comes with a new lock cylinder, but the only part that needs replaced is the halo.

Chevrolet Cars &... | Answered on Apr 09, 2019


I can’t broke the bolts on the crankshaft pulpy I put wd40 them but will not come off

2001 Chevrolet... | Answered on Apr 09, 2019


My equinox suv TPMS cannot be reset why

2011 Chevrolet... | Answered on Apr 09, 2019


This sensor is located in the rear of the cylinder head, I have attached a diagram for you:

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2008 Chevrolet... | Answered on Apr 08, 2019


Probably your service engine soon light

Chevrolet Cruze... | Answered on Apr 08, 2019

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