Northstar Engine

A Typical Sequence of Events in Cadillac Northstar Models

  • Often when a Northstar overheats, a mechanic checks the cooling system and finds nothing wrong.
  • With no clear indication as to what’s causing the overheating problem.
  • A mechanic may suggest replacing various cooling system components, like a radiator, water pump, or thermostat.
  • Eventually, coolant starts disappearing again, and the overheating returns.
  • If this sounds familiar, it is time to get a proper diagnosis. An experienced Thermalweld technician can provide the fastest and most cost-effective head gasket repair solution to your problem.
  • To mechanically repair the head bolt problem requires a complete teardown.
  • Drilling out the head bolt threads, installing new sleeves, and replacing the head bolts.
  • Some repair shops refuse to replace a Northstar head gasket.
  • For the ones that will, the starting price is $2,400 up to $4,500.
  • Many suggest “just replace the engine.” Replacing the engine is in the $5,000 to $7,000 range.

The Problem…

Here are the facts!

  • Galvanic corrosion damages the head bolt threads on the block. Once the head bolts lose tension, the head gasket allows combustion chamber gases into the cooling system.
  • Combustion gases will form air pockets in the cooling system, causing thermostat malfunction and overheating.
  • The Northstar engine has a constant air purge system to prevent air lock of the thermostat, but this is overwhelmed when the gasket head bolts fail.
  • Under heavy power demands, the head gasket will allow more gases into the cooling system than under light power demands. That is why the engine may be okay while driving on flat streets, but overheats very quickly at freeway speeds or while climbing a steep hill.


Let Thermalweld help you properly diagnose your Cadillac’s overheating problem and ultimately determine if you have a head gasket problem.

Welcome to Thermalweld – Your Specialist in Cadillac Northstar Head Gasket Repair!

We are a Veteran owned and operated automotive repair company, dedicated to providing top-quality solutions to head gasket problems for Northstar and Cadillac vehicles. With over 27 years of experience, our team of experienced technicians has developed unique techniques and methods to repair, with a
head gasket sealer.

We understand the frustration and stress that come with engine troubles, especially when it comes to head gaskets. But don’t worry – we are here to help you get back on the road with optimal performance and efficiency.

If you own a Northstar or Cadillac with head gasket problems, you may be wondering about the cost and details of the repair process. In this page, we will answer some of the most common questions and concerns regarding Northstar head gasket repair.

What is Northstar Engine Head Gasket Repair?

The Northstar engine is a popular engine type found in some Cadillac vehicles. While it offers many benefits, such as powerful performance and reliability, it is known for having issues with head gaskets. A head gasket is a crucial component that seals the cylinder head to the engine block. If the head gasket fails, it can lead to several problems, such as overheating, coolant leaks, loss of power, and more.

Northstar head gasket repair is the process of fixing the head gaskets on these engines. At Thermalweld, we use state-of-the-art equipment and techniques to ensure that the repair is done correctly and efficiently.

What are the Symptoms of Northstar Head Gasket Problems?

If you suspect that your Northstar engine has head gasket problems, it’s essential to diagnose the issue as soon as possible. Some common symptoms of head gasket problems include:

  • Overheating: One of the most common signs of head gasket problems is overheating. The head gasket helps keep the engine cool by preventing coolant from leaking into the cylinders. If the gasket fails, the coolant can mix with the engine oil, which reduces its effectiveness in cooling the engine.
  • White Smoke: If you see white smoke coming from the tailpipe, it could be a sign of a head gasket problem. When the head gasket fails, coolant can get into the combustion chamber, where it gets burned along with the fuel and creates white smoke.
  • Loss of Power: If your Northstar engine is losing power, it could be a sign of head gasket problems. A damaged head gasket can cause a loss of compression, which reduces engine power and performance.
  • Coolant Leaks: If you see puddles of coolant under your vehicle, it could be a sign of a head gasket problem. When the gasket fails, coolant can leak out of the engine and onto the ground.

If you notice any of these symptoms, it’s essential to bring your vehicle to a qualified technician as soon as possible. The longer you wait, the more damage can occur to your engine, which can lead to higher repair costs.

What is the Cost of Northstar Head Gasket Repair?

We offer competitive pricing for a head gasket repair liquid.

In general, the cost of Northstar head gasket replacement can range from $3,500 to $5,000, depending on the extent of the damage, the type of repair needed, and the labor costs. While this may seem like a significant expense, it’s important to remember that head gasket problems can lead to more severe engine damage if left untreated.

Why Choose Thermalweld for Your Northstar Head Gasket Repair?

When it comes to Northstar and Cadillac head gasket repair, it’s essential to choose a qualified and experienced technician. At Thermalweld, we have over 27 years of experience in repairing head gaskets on Northstar and Cadillac engines. Our experienced technicians have the knowledge, skills, and tools needed to diagnose and repair head gasket problems quickly and efficiently.

We use only the best quality parts and materials to ensure that your repair is long-lasting and reliable. Our team is committed to providing exceptional customer service and support, and we guarantee all of our work.

At Thermalweld, we understand that engine troubles can be stressful and frustrating. That’s why we strive to make the repair process as smooth and hassle-free as possible.



  • Martha Stewart
    July 7, 2017 at 1:32 pm

    I would suggest going to this company to all of my friends and colleagues! It is definitely the best on the market today!

    • Mike Newton
      July 7, 2017 at 1:32 pm

      We appreciate your positive feedback!

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