just wondering if anyone knows whether or not a change would need to be made to cmr tune after changing thermostat....

You'll want to adjust the temperature that the cooling fans turn on.

Wade posted a thread on the forum on what to do.


from centraltexhemi
Turn on Predator and go to the Performance Tunes line.

Agree to the disclaimer
Press the Custom Tune line (not sure on the Diablo Canned Tunes?)
Select the tune that you prefer (if you have more than 1 tune saved).
Go to the Modify Tune line.
Agree to disclaimer
Then select Modify Parameters.

Now you need to look for the "Cooling Fans AC Off" line.

Now you will see 6 sublines.
170* Setting 180* Setting (first number is for the 170 second is for the 180)

High MPH HS Fan On
184.xx -170 stat / 195.xx-180 stat

LS
166.xx -170 stat / 178.xx-180 stat

MS
175.xx-170 stat / 185.xx-180 stat

Low MPH HS Fan
184.xx-170 stat / 195.xx-180 stat

LS
166.xx-170 stat / 178.xx-180 stat

MS
184.xx-170 stat / 195.xx-180 stat

Once done with the above, exit back to the list of parameters you want to modify and go down one line to the, Cooling Fans AC On line. There will only be 3 sublines to do here:

HS Fan On
184.xx -170 stat / 195.xx-180 stat

LS
166.xx-170 stat / 178.xx-180 stat

MS
184.xx-170 stat / 195.xx-180 stat

Exit out and install tune.

Hope that helps.

Frank, double check w/ Andy or Jim. I believe your tune already had the modified fan settings.

http://www.cherokeesrt8.com/forums/showpost.php?p=560949&postcount=68

http://www.cherokeesrt8.com/forums/showpost.php?p=560949&postcount=68

yup, thanks... saw that this morning...... one more question---- i noticed that the temp seems to be jumping around quite a bit never going over 200 but still jumping between the 185 and 200... im also hearing a water swooshing sound, i read up on topping off the coolant and have it topped off as much as i can go... i guess i will check it again tonight...

yup, thanks... saw that this morning...... one more question---- i noticed that the temp seems to be jumping around quite a bit never going over 200 but still jumping between the 185 and 200... im also hearing a water swooshing sound, i read up on topping off the coolant and have it topped off as much as i can go... i guess i will check it again tonight...

Sounds like you might have an air pocket in the system. After you drive it and get it up to temp, open the cap for the coolant tank and it shoudl burp itself.