My Jeep Grand Cherokee Over heated on the high way the other day. The check gauges light came on. Pulling into a station I noticed coolant had leaked all over under the hood and was smoking off the engine. At first I thought it might been just a leak in the cap because I was able to retightened. Getting back on the high way it took about only a mile for the thermometer to reach max temperature. Here I pulled over and waited a few minutes before trying to start it again. it sputtered and waited another 20 or so minutes before it was on again. Driving it only a few miles to the closest town the meter reached max temp and then fell back down to no temperature reading. It got into a shop about an hour after this. They ran a block test and said their was exhaust backed up into the coolant. They're estimating a very large bill for this. $1,500-3,500 saying it could be a blown gasket or may need a new engine.
If there's any advice on how to move forward or if any ones run across this problem and found another solution I would love the input or experience.