Thermalweld – Combustion Leak, Block Test Kit

£18.99

Take the guess work out of diagnosing a blown head gasket

The Thermalweld Combustion Leak Test Kit is a simple, accurate tool designed to help you quickly identify the presence of combustion gases in your cooling system – the most common sign of a blown head gasket, cracked block, or warped cylinder head.

Read below on how to claim 50% back on this product.

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Description

How to Claim 50% Back

  • Confirm the issue using the Thermalweld Combustion Leak Test Kit
    – The test will change from blue to yellow if combustion gases are present in the cooling system. This confirms a likely blown head gasket or similar internal leak.
  • Purchase a Thermalweld Repair Kit from Thermalweld.co.uk
    – This offer is only available for direct website purchases to ensure a smooth refund process.
  • Contact our support team through live chat
    – Provide us with:
    1. Your combustion test kit order number

    2. Your Thermalweld Repair Kit order number

    3. Confirmation that the test showed a positive result

  • We’ll refund you 50% of the combustion kit price
    – The retail price of the combustion test kit is £18.99
    – You’ll receive a £9.50 refund back to your original payment method

Why We Offer This

Too many drivers waste time and money repairing the wrong thing. With this offer, we’re helping you:

  1. Diagnose the fault before spending on repairs

  2. Save money by using an accurate test

  3. Feel confident you’re solving the right problem with the right product

We’re not here to sell gimmicks — we’re here to fix your car properly.

Fast, Reliable Diagnosis of Blown Head Gaskets

The Thermalweld Combustion Leak Test Kit is a simple, accurate tool designed to help you quickly identify the presence of combustion gases in your cooling system – the most common sign of a blown head gasket, cracked block, or warped cylinder head.

Unlike traditional pressure testing or guesswork, this kit uses a visible chemical reaction to confirm leaks in minutes. The included S-valve detection chamber is filled with a specially formulated indicator fluid that changes colour when exposed to carbon monoxide from combustion gases. If combustion gases are present, the blue fluid will turn yellow—giving you a clear, visual answer without invasive engine work.

Key Features:

  • Accurate Diagnosis: Detects combustion gases in the cooling system from petrol or diesel engines.
  • Quick Results: Colour change typically occurs within minutes of engine idle testing.
  • Reusable System: The S-valve tester can be used multiple times—just refill with indicator fluid.
  • Safe & Simple to Use: Designed for home mechanics and professionals alike, with no complicated setup or tools required.
  • Essential Companion to Thermalweld Sealer: Use before applying Thermalweld to confirm diagnosis and qualify for money-back guarantee.

Kit Includes:

  • Reusable S-Valve Leak Tester
  • Bottle of Thermalweld Indicator Solution
  • Silicone Bung for Radiator or Expansion Tank Fitment
  • Step-by-step Instructions

Whether you’re unsure of the issue or verifying a repair, the Thermalweld Combustion Leak Test Kit takes the guesswork out of diagnosis—saving you time, money, and potential engine damage.

 

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