Shinobi'sZ
Member
Thank you shinobi for your response. I will keep the possible leak problem in mind. I did have the shop flush the cores. They pinched off the lines individually and forward & back flushed each one until nothing came out of them. I took my truck to a radiator shop who specialized just in this. Right now my truck get enough warm air to keep it comfortable in the cabin. I would say it gets to around 70 degrees inside the cabin after half an hour on a 35 degree day. Fortunately our expedition is our extra vehicle that gets used mainly in the summer to pull our popup trailer for camping or for when one of our other vehicles are in a shop.
I am contempt right now with my truck. I will try the CLR flush when I start losing heat. I asked about the hoses & CLR because others on here have claimed to sprung leaks in their hoses after using the prestone flush, sometimes as early as 3 months.
The Prestone flush is an acid like CLR, both which are contained in plastic. More than likely the people who have had issues are having leaks from the actual core itself after the rust was removed. Im doubtful it would eat the thick rubber hose enough or melt it. I spilt some on the outside of my hoses and it cleaned them, they look like brand new hoses. No sign of eating the rubber.