Your Peugeot 309 engine control system detects a problem, the computer stores the diagnostic trouble
code U3639 in its memory.
To figure out what is wrong with your vehicle you must first extract the U3639 DTC For Peugeot 309.
U3639 Peugeot 309 engine problem can be occur defective fan clutches are a common and often overlooked cause of engine overheating. The shear characteristics of the clutch fluid gradually deteriorates over time, with an average loss in drive efficiency of about 200 rpm per year. Eventually slippage reaches the point where effective cooling is no longer possible and overheating results. (On average, the life of a fan clutch is about the same as a water pump. If one needs to be replaced, the other usually does too.)
U3639 Peugeot 309 DTC Meaning
Network Code - Problem is climate control system, lighting, airbags, etc.
SAE - Generic
Vehicle Speed Control And Idle Control System
Low Coolant Circuit
A/C System High Pressure High Temperature
When you turn on the ignition, the Service Engine Soon or Check Engine U3639 Peugeot 309 light should flash briefly, indicating that the OBD system is ready to scan your vehicle for any malfunctions. After this brief flash, the light should stay off while you drive as long as no problems are detected. If U3639 DTC For Peugeot 309 so, you'll be glad to know that your vehicle is equipped with an early warning system that could save you time, money, and fuel in addition to helping protect the U3639!