My srx loses coolant at a rate of about 4-6oz every 2wks to a month.I have had all types of testing done, and no one has been able to find the leak, internal or external. I have no lights on and have never over heated. I have been told that it could be a head gasket, but i had the test for combustion and pressure done both negative.
I have also been experiencing the issue of low coolant with my SRX. I have on quite a few different occasions noticed that I smelled coolant and checked to see I could see any leaks, but I was unable to see anything. I live on a hill and as I stopped and began backing in my driveway today I noticed a strong coolant odor. When I got out to check the vehicle it now appears there is a leak coming from somewhere under the car. When I turned the car off, the dripping stopped. My next stop is to the repair shop. (Keeping my fingers crossed that it is not a pricey repair...)