you have to ake the susepnsion out, track off and from there is depend. it radiador is held on by rivits so you can just drill them out, the prolbem is the hoses on the front. i had to pull the motor on on to get to the claps on these hose. some sled you can reach them with a good pair of eagles beaks. you will have to take it abpart and try
i had the same problem on my cat. if you know somebody with a tig welder, just take out the suspension,track, and driveshaft, and the exchanger can be welded. this will save you time, as you will not have to take the exchanger out to get it welded.
i have had mine welded from having a pick go through it, 7000 miles later still no problems
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