Originally Posted by kcdehart

FIXED

Replaced my radiator last week, and after driving 11+ hours this weekend in different intervals (up to 5 hours at once) and having no residual pressure in the system after letting it sit for several hours after each time, I'm considering the issue fixed! The coolant is also now actually dropping to the proper level once it cools down.

The old radiator had a small leak above the petcock and was *covered* in mud on the back, which I'm sure didn't help the fan's job trying to cool it. I'm also fairly certain it was clogged, as when I drained it, only a gallon or so of coolant drained out. But after removing it, flipping it around several times, more coolant proceeded to unexpectedly pour out.

I'm still getting the water rushing sound when I turn the truck on sometimes, but I'm assuming I just need to burp the coolant more, as the front wasn't elevated when I burped it last time. So, the heater core was definitely above the radiator cap.

So, hopefully anyone that finds this and has similar symptoms as myself will be able to come out of it without a headgasket replacement...

Originally Posted by JustinCG

'

Thanks for sharing. I have been dealing with this same type of issue for a few months now. I took it into a shop and they had to replace the waterpump seal. the pump was replaced 20k ago and the mechanic said that the person who put in my pump didn't replace the seal...but the same type of leak is back again just how you described it. I open my radiator cap and its full. but my reservoir coolant always goes down to the bottom. I have coolant marks on the top of the reservoir. do you think its the radiator?