Jaguar XJ-S V12 Air Conditioning Fix | Diagnosing & Recharging the System
While driving my 1989 Jaguar XJ-S V12 Coupe to the Silverstone Festival 2025, I discovered my air conditioning wasn’t working properly. In this video, I take you through my troubleshooting process under the bonnet, checking key components of the A/C system before discovering the real culprit – low refrigerant gas. I walk through each diagnostic step, from relays and compressor checks to the heater matrix valve, before re-gassing the system and confirming cabin vent performance with an infrared temperature gun. If you own a classic Jaguar XJ-S, this guide may help you track down similar issues and understand how the A/C system works on these cars. 🔧 What I cover in this video: Checking the 10A black relay and A/C electrical system Inspecting the GM Harrison A6 compressor magnetic clutch Testing the heater matrix valve operation Measuring A/C system gas pressure Safely topping up the refrigerant gas Verifying air vent temperatures (hot & cold) Bonus: checking how hot my engine runs! 🛠️ Tools & Parts Used in this Video: Posidrive screwdriver Car Aircon Top-Up Recharge Refill R134a kit (inc. gauge) Additional R134a Refill Cannisters × 2 Etekcity Infrared Thermometer Gun (-50°C ~ 450°C) 📌 Video Index 00:00 - Introduction 00:44 - Overview 04:29 - Checking the 10A Black Relays 05:55 - Checking the Magnetic Clutch on the GM Harrison A6 Compressor 07:24 - Checking the Heater Matrix Valve Operation 09:04 - Re-checking the Air Conditioning Gas Pressure 10:10 - Topping-up the Air Con Gas 12:39 - Verifying Air Conditioning Effectiveness (Hot and Cold) 15:15 - Extra: How Hot is My Engine? 👉 If you enjoy classic Jaguar troubleshooting, repairs, and road trips, don’t forget to like, comment, and subscribe to Too Old Classics for more XJ-S, X356, XJ40, and S-Type R content. #JaguarXJS #JaguarXJSV12 #ClassicJaguar #XJS #JaguarV12 #CarACFix #ClassicCarRepair #R134aRecharge #DIYCarRepair #TooOldClassics
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