You might pressurize the coolant system. you can get a "tank valve" from O'reillys for less than $3 & it has an 1/8NPT male end & screw it into the coolant sensor port & use your air hose on the schrader valve & go to maybe 15 psi. be carefull & add air in short blips then use your tire psi gauge so you dont blow out the system. Sure sounds like a coolant leak on the driver side. Holler how it goes.