Overheating

Robert explained the gumming up is due to the reaction of the chemical and antifreeze. They tell you to replace the antifreeze with water, do the chemical and let it work, then replace the water with antifreeze. Also comes with a bypass that is cut into the top rad hose Sounded believable.

I would do the job and report back to you.

Their method is different. Don't idle after installation, drive at 60 MPH for five minutes which puts pressure on the chemical. I'm skeptical like you. It costs $250.00 plus shipping. These guys are going to send it to me for free. I only pay if it works. I'm going to do a careful install and analysis and report back. Shall I copy you?

I posted my excellent results with Thermalweld head gasket sealer on Sunday but it is not up. Did you receive it?

I live in a condo at the top of a small mountain. Half way home, my temperature gauge would redline and bells would scream at me. My previous posts detail what I did to try and solve the overheating problem - to no avail. It was the head gaskets and I was quoted $4,000.00 to $5,000.00 to replace them.

I found a website on the internet that said their chemical would repair my head gasket. One always wonders if these type of claims are true, but I tried it because the alternative was spending $4,000.00 to $5,000.00.

I want to be perfectly clear on what I did and the result. I followed the supplier's directions and flushed the coolant system with fresh water until I was positive there was no DexCool antifreeze left in the system - the antifreeze reacts unfavorably with their chemical. My engine is a Northstar 4.6L V8 which required a mod to the coolant return line that came with the kit. I was told to add the chemical two small bottles and then drive on the freeway for ten miles keeping my RPM's between 3,000 and 4,000. That wasn't necessary!

The head gasket sealed before I even got to the freeway! Wow! I did what I was told anyway. I have now driven 300 miles at highway speed (it overheated before) and climbed my mountain a dozen times. The temperature gauge needle stays in the middle. I have now flushed the system again to get rid of any excess chemical and replaced it with distilled water and 12 ounces of "Water Wetter". I'll re-install the antifreeze before winter sets in but will not use DexCool (orange color) as its cleaning action will eat the repair (and probably ate the head gaskets). Use a green antifreeze.

All these instructions are available on the supplier's website and included with the product. Plus you can call them anytime. They are very helpful with fantastic customer service. Here's the website: www. Thermalweld. Com. Use it. It's fantastic! It works in any car.