Continual coolant leak.

[Trickster29]

One thing that works for me is to put the car (any of them) on an incline when doing this, to help the Air easily pass to the highest point.. Park on a hill with the front facing up hill and top it off, let it run, then rinse and repeat..

Souns like a burp issue, and youll also see if anything is coming out of the tail pipe.. If coolant (or cloudy sweet smelling smoke is coing out), you might be burning coolant or have a gasket failure.. Whats the temp inside show ..? Right at 210 degrees or higher?

With the new thermostat its normally 190F. But I've never seen it go passed 205F. My driveway kinda has that slope on it by default. But it's nice to know that's actually a benefit. Thank you

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[Trickster29]

I'm thinking you just had an air bubble in the block and the core wasn't full yet. Betting you'll be fine now. Let us know. Also, you can slide cardboard under there to save your driveway from more spots and it makes new drips really obvious.

If I have any extra cardboard in the garage I'll move it there. Thanks for the advice.

Also thanks for the positive thoughts.

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[Dan Devine]

We have a 2001 Yukon XL that had a similar problem as you described. I replaced the water pump, could never find any leaks, but it was always down a little bit. Then it got worse and needed more coolant each week. I finally pulled the valve covers off and found that the heads had hairline cracks (common problem on these heads). Under the valve covers looked like peanut butter mashed in there. This dexcool doesn't seem to behave like the old coolant, it turns into a thick goo instead of going into the oil pan. I found welded heads and replaced them myself, 3 years later still good. I hope this isn't your issue, easy to pull the valve cover and check. It was a lot of work, but all doable, took me 2 days. $700 for everything I needed, dealer wanted $4K.
BTW, Autozone will loan you a pressure tester.

 

[Trickster29]

We have a 2001 Yukon XL that had a similar problem as you described. I replaced the water pump, could never find any leaks, but it was always down a little bit. Then it got worse and needed more coolant each week. I finally pulled the valve covers off and found that the heads had hairline cracks (common problem on these heads). Under the valve covers looked like peanut butter mashed in there. This dexcool doesn't seem to behave like the old coolant, it turns into a thick goo instead of going into the oil pan. I found welded heads and replaced them myself, 3 years later still good. I hope this isn't your issue, easy to pull the valve cover and check. It was a lot of work, but all doable, took me 2 days. $700 for everything I needed, dealer wanted $4K.
BTW, Autozone will loan you a pressure tester.

It actually turned out to be both the water pump and a cracked overflow tank. I'm glad it wasn't that bad. But thank you though.

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