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Gave up trying to fix the problem and reinstalled the smaller factory radiator. Everything works fine now, this is the second time the original radiator has been reinstalled. This tells me the thermostat is working fine. Though we did try three thermostats as that was our first thought too.

No, this was done by an after market shop.

No, just the opposite, if the car is sitting still the temp will reach normal operating temps. When driving down the hwy the temp gauge drops to 165-175.

It been suggested to me that sometimes when changing a radiator that pockets of air get trapped in the engine block. That running the engine up to operating temperature with the radiator fill cap off will remove the air pocket/bubble. So far this is the only thing I have left to try that makes...

Mine replacement radiator is a double cooling core with engine oil cooler lines. The old radiator already had trans cooler lines. I just tried (some engine oil still on my hands) disconnecting the oil cooler lines and did a test drive. The engine temp gauge still read lower than I think it...

Gear Head, Did you add engine oil cooling lines with the new radiator?

Update: Still no luck, thought the problem had been solved but no both problems are still showing up. The engine hot message still comes up every three days or so and goes away after disconnecting the battery. My son had a thought on this problem, he was wondering if the new larger radiator...

True, I didn't mean it to sound like they put in more than the radiator can hold. I meant they put almost all antifreeze and no water, instead of a 50/50 mix of coolant and water. Though being a manufacturing engineer working with design engineers for the last 27 years, I'm not real sure if they...

I did go out and check the sensor, will have to wait and see it that fixed that problem. I just change out the thermostat, even though the existing one looked good. The Tahoe is now running well within normal operating temperatures. At first I thought it must have been the thermostat but after...

Thanks for the tip, maybe now that engine overheat message will stop showing up. Sound like good thing to check out. In fact I just went out to check and clean that connector. Don't think it was ever touched when changing out the radiators but then again it is hard to watch everything the shop...

Changed out the radiator in my 2013 Tahoe from the stock one to a radiator that allowed me to installed the engine oil cooler lines. The new radiator is an all aluminum core with aluminum side tanks for the trans and oil cooler lines. I have also installed an external trans cooler (it work...

Thanks, don't plan on digging into it myself but good to know when dealing with the service department.

I will be taken the Tahoe into a dealer but would be nice to know what to look for with this problem. Thanks, Craig

We have a 2013 1500 Tahoe LT with luxury package, sun and sand package duel climate control system with rear controls. Not sure what you mean by HVAC system?

We are getting very little air out of all the rear roof vents.

Make sense but the Tahoe is only a year old, will look into that as it is still under the factory warranty.

I'm sure my air flow problem has nothing to do with a coolant leak. Your post just seemed like a good place to ask the question about air flow. Thanks for the response to my question. :) Craig

Interesting, would never have thought that 20" tires would get better mpg. My Tahoe has 18" tires.

A/C coolant leaks are not normal and unhealthy to the people inside the car. Thanks for the pictures and follow up on your A/C problem. Question for you, how much air flow do you get out of the rear air vents? I can hear the rear fan blowing hard but don't seem to get a lot of air out of...

Hi All, Just pick up a 2013 Tahoe to pull a 6,000 pound travel trailer. Have been reading through a lot of threads so far and I'm finding loads of great tips. So far, after only three days of having the Tahoe, I'm very pleased with the car, better MPG (1mpg city, 2 mpg hwy) and power than the...