Originally Posted by 7ate90xj
How do I burp the system its a 1990 XJ ? start it get it hot and kink the hose? thanks guys for any input!
Why are you kinking the hose? The most recomended way is to find a small hill or lift the rear end high enough so the rear of the engine is above the front. Loosen the coolant temperature sensor on the back of the valve cover and wait for coolant to come out. This helps the air get out. it also helps to drill a tiny hole in your thermostat and place it at the 12 o'clock position to allow any air in the engine to ge out.
As far as the switch it just raises the shift points of the transmission. if you put it in economy it shifts like 200 RPM sooner to keep the engine speed down. Later models were permanently in power mode and the switch was eliminated. I keep mine in economy just because. Most will tell you to put it in power and leave it.