how much would it cost to have a mechanic fix 1 freeze plug on 1998 Jeep Grand Cherokee

its on the back of the motor on an 98 jeep grand cherokee

Asked by for the 1998 Jeep Grand Cherokee
is it behind the transmission or just the back of the head
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i ask w/same problem $325.00 (mechanic price)
i did w/ my son cost me $16.58 (5 freeze plug)
go to you tube & see how simple is take me 1 hrs.