Michael Sachs (“The Jag Doctor”) is the owner of Sachs Automotive, Inc. and has been working on Jaguar cars since 1989. He is a former member of the Jaguar Master Technician Guild as well as an ASE Master Auto Technician and the official late model technical expert for the JCCNF. 

IF YOU READ NOTHING ELSE IN THIS ARTICLE, READ THE STATEMENT BELOW

The Jaguar temperature gauge is NOT a gauge as we have all become accustomed to. It is more of a broad band switch.

When a Jaguar temperature gauge is reading in the center at the N for normal, the actual temp can be anywhere between approx. 180 to 220. Just because the temp gauge is showing normal does not mean the engine is not running hotter than it should. Simply put, if the fans are running longer than in the past, your engine is running hotter than it should and you need to have the cooling system checked asap.



 “WHAT IS FAN RUN ON ?”

Fan run on is when your engine cooling fans continue to run at maximum speed for an extended period of time while sitting still or after you turn off the ignition. According to Jaguar it is normal for the fans to run for as long as 4 minutes after turning off the ignition. My personal experiences are that they usually turn off within a minute or so, even in the summer. The efficiency of the cooling system well exceeds the needs of the car which is why there is a thermostat. If you were to remove the thermostat or it sticks open, the engine would never reach operating temperature. It is important that operating temperature is reached as quickly as possible for emission and fuel economy purposes. There is even a code that will turn on the check engine light if the engine is running cooler than required. If by chance you experience your cooling fans staying on longer than you are accustomed, have it checked asap by a qualified technician. At Sachs Automotive cooling system repairs are among the most common we see…