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.
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: -
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Your combustion test kit order number
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Your Thermalweld Repair Kit order number
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Confirmation that the test showed a positive result
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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:
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Diagnose the fault before spending on repairs
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Save money by using an accurate test
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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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