Diagnostic Doctor www.aftermarketonline.net OCTOBER 2026 the coolant revealed significant contamination. On these vehicles, a silicate bag within the expansion tank is designed to prolong coolant life, but it is a known issue for the bag to burst, allowing debris to circulate and block the heater matrix. This was highlighted within the Troubleshooter Tips in my Snap-on diagnostic tool, and further inspection confirmed the heater matrix was restricted and required replacement. By applying simple diagnostic checks, such as comparing inlet and outlet temperatures, restriction can be confirmed quickly without LIQUID TOOLS FOR PROFESSIONALS www.jlmlubricants.co.uk DISCOVER THE POWER OF JLM LUBRICANTS. ;&1;* (1*&3.3, 7JRT[JX HFWGTS GFXJI IJUTXNYX YMFY FHHZRZQFYJ NS YMJ HTRGZXYNTS HMFRGJW FSI GJMNSI YMJ [FQ[JX INTAKE CLEANER & MNLM UJWKTWRFSHJ XTQ[JSY KWJJ HQJFSJW YMFY YFWLJYX FSI WJRT[JX HFWGTS IJUTXNYX TNQ WJXNIZJ FSI XTTY .RUWT[NSL JSLNSJ JKąHNJSH^ FSI J]YJSINSL JSLNSJ QNKJ. ^ ÈģèÎģĊÈģ out more. NEW! Everyone wants to get what they paid for. Aftermarket is independently verified by ABC, because we want our advertisers to know they’re getting the exposure they’ve been promised. 17,274 Average Circulation per issue, July 22 - June 23. ABC. See it. Believe it. Trust it. BE WISE WHEN YOU ADVERTISE www.abc.org.uk To advertise call Angela Lyus on 01732 370340 or email angela@aftermarket.co.uk Ad - Be Wise when you advertise - House Ad (90x129).indd 1 24/06/2024 10:55:14 22,797 Average Circulation per issue, July 2024 to June 2025 unnecessary disassembly. A common mistake in this situation is to replace the heater matrix without addressing the underlying contamination. If the system is not thoroughly flushed, debris can remain, and the fault can return. To prevent repeat issues: O Ensure the cooling system is fully f lushed O Inspect or remove the silicate bag O Replace the expansion tank where required O Use the correct coolant specification Modern diagnostics is no longer just about testing components; it is about understanding how systems behave in real-world conditions. In this case, the Troubleshooter Tips provided clear visual guidance for this issue, something that can help technicians quickly identify the root cause and avoid unnecessary repeat repairs. 19
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