This thread might get better coverage if it were located in the Technical forum, since it isn't related to car mods (yet!)
A suspension failure message is displayed when the Electronic Suspension Control module detects or suffers a fault and the suspension system enters a "safe" mode. The safe mode is caused by the ESC module internal diagnostic when it detects a fault code (DTC) It can be caused by a failed shock, wheel position sensor, steering wheel position sensor, or a faulty Suspension Control module.
The ESC system uses a different kind of self-troubleshooting method called the "Ignition Cycle Diagnostic Approach," to reduce false fault codes that don't really reduce the functionality of the ESC system. The fault must be present for a few ignition cycles before the "Speed Limit " message will be displayed. As long as the fault remains, it will stay in memory and the "YOU'VE GOT ISSUES" message will be displayed at every ignition cycle. It can be removed from the display with the RESET switch.
When this message is displayed, the system enters a Fail Soft mode. This means if a shock fails, the system tries to compensate and sets all of the shocks to a Tour setting, and since they aren't available for higher speed performance, the system isn't optimal for speeds of more than 80mph.
For the cooling message issue, assuming there isn't a genuine coolant leak, if your temp and coolant system pressure levels are normal, and your cooling temperature is good, you may have a faulty coolant level switch, located on the bottom of the coolant reservoir, or a failed engine coolant temp sensor. You'll enjoy using the Tech 2 to diagnosis coolant-related issues. It takes inputs from a variety of sensors to help you take aim at the problem fast.) There are other things it could be, but those are the biggies.
CC