Technical 21 www.aftermarketonline.net MARCH 2025 PROTIPS In this issue, replacement car parts pioneer febi focuses on the coolant expansion tank… Problem Coolant loss and engine misfiring, but only when the engine is at operating temperature and under load. Engine management lamp illuminated. Cause Due to thermal stress and engine drive cycles with dramatic changes in temperature, the coolant expansion tank becomes brittle and discolours, leading to cracks appearing in the plastic, sporadically leaking coolant. Under certain conditions this can result in hot coolant being forced under pressure over the engine, soaking the ignition leads and spark plugs with coolant. This leads to the engine misfiring. Solution Check the condition of the coolant expansion tank. If it has discoloured then the plastic has become brittle with age and could be at risk of cracking and leaking. If found in this condition during routine maintenance, replacement is advised before any coolant loss issues occur. If the vehicle is displaying symptoms of an engine misfire, check for any fault codes stored in the engine control unit and then remove the ignition leads. Inspect for corrosion and condition and for any coolant buildup around the spark plugs, replacing parts as required. To fit a new coolant expansion tank it may be necessary, depending on the model, to remove the headlamp for ease of access. Unclip all hoses and pipes, drain the excess coolant, then free the expansion tank from the metal tags securing it to the inner wing. Replace with new febi expansion tank 188342 and cap 105933, clip into place, and refit all hoses and pipes. Top up the cooling system with fresh coolant mixture and refit the headlamp as required. Start the engine, check for any leaks and the smooth running of the engine. LIQUID TOOLS FOR PROFESSIONALS www.jlmlubricants.co.uk DISCOVER THE POWER OF JLM LUBRICANTS. DPF CLEANING A quick acting on vehicle solution designed to clean diesel particulate ĊÁèÝáģĺ W&áĻģĥ INTAKE CLEANER A high performance solvent free cleaner that targets and removes carbon deposits, oil residue, and soot. Improving Ȫ²Èģ©Ċ²Èþģ Èģ extending engine life. ^ 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 21,945 Average Circulation per issue, July 2023 - June 2024
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