REVIEWS

I tried a different product which did not work. I had great customer service and support. The tech had knowledge about my vehicle, 93 Cadillac Seville, gave me advice on maintaining it beyond the treatment, and understood the intricacies of the NorthStar motor. The instructions were simple to understand and the product worked as promised. Thank you!

Great service and product had a $5500 quote repair bill from Subaru this product fixed the seal.

I’d purchased a 2001 DeVille hearse with the Northstar engine. Bought it knowing it had an overheating issue. I’m no mechanic and didn’t know the Northstar engine history. I was repeatedly told to junk the car as it was not worth fixing. I saw a video of Thermalweld on YouTube. I followed their instructions exactly. I am now a happy customer ! I drive my car daily. Almost 10,000 miles later and NO overheating issues! Thank you , Thermalweld !!

I've used thermalweld on vehicles starting back in 2022 and it is the best head gasket repair sealant on the market as far as I'm concerned. And every one of the cars are still running great today.

Phone: (623) 271-0226
Extension: 5 - New Extension
Grasshopper #: (844) 796-7968

Hello, my name is Jimmy Peralta. I live out in Arizona. I used the Thermalweld a few times now and every time it produces very good results. I highly recommend it. The customer service is outstanding. If you have a blown head gasket I would definitely recommend you try this product and I can't guarantee it but it's highly highly effective that's what I would have to say. Thank you so much for listening and have a great day.

After all the critics online on forums claiming "Blown Head Gasket" is why my 04 Deville was overheating, I turned to Thermalweld and spoke over the phone to one of the Northstar specialists "Dave". He walked me through diagnosing a blown head gasket, which turned out not to be the problem. All the way to finding the culprit of my overheating being the rear metallic coolant line on the driver side leaking from being detached from the housing. Saved me a huge amount of money on not having to scrap my old Deville. Thanks for the help.

I tried this great product on my 1997 caddy deville, and it’s been about a year . I’m still rolling with and without ac. No overheating issues almost 200k on my caddy. I must say this is truly a great product and didn’t cost me thousands in repairs👍🏾👍🏾

Phone: 5059776***

Hi, my name is Dan and I live in Arizona, I used the Thermalweld product on my 2013 Prius V, it had a small head gasket leak which caused the infamous "death rattle" when I first started the vehicle up in the morning. I used Thermalweld and fixed the problem almost immediately. The Thermalweld customer service is outstanding! they walked me through the process, answered all my questions and it's obvious they stand by their product 100 percent! I highly recommend this product and at the fraction of the cost of an actual head gasket repair, don't hesitate or think about it--Buy It Now!

Phone: (909) 586-2***
Extension: 5
Grasshopper #: (844) 796-7968

After trying Bars Leaks that lasted for about a week I decided to give Thermalweld a try. My Toyota 4-Runner has been running strong for the past 6 months with no head gasket issues. Thanks for the excellent product.

Phone: (620) 264-0***
Extension: 5
Grasshopper #: (844) 796-7968

Hi this is Mike, I thought this product was excellent. I think it saved the longevity of my truck, and it was very easy to use. And the technical support people were awesome, because I called and had a few questions. They basically talked me through the whole situation. I think I just saved my truck, so thank you and thank Thermalweld and it definitely works if you do it right. Thank you.