Do you have rear heat and a/c if so your heater core is leaking or one of the coolant lines to the rear heater are leaking. if coming from a drain its the heater core. Look under and see what its coming from. The lines need a special tool to get off J38723 is the number for the tool not mater which its leaking you need the tool to get the lines off. The lines run under from front to back, the heater core is inside the quarter trim panel and in a case that you take apart the Rt. inner wheel house also has to be removed for the lines that is where they connect to the heater core.
Do you mean antifreeze is blowing out of the back of the truck? as in blowing out of the exhaust? it is unclear what your question is but if this is it, then your head gasket is blown
I don't understand the question..are you talking about a film on the back bumper, a puddle on the ground, or liquid pooling in the cargo area?...
What do you mean "antifreeze is blowing in the back of the truck", that is not clear at all.
I’m happy to assist further over the phone at https://www.6ya.com/expert/josh_8f8ad0a8f7e0e6d3
SOURCE: 98 yukon heat not working, antifreeze low
Fill the tank with the CORRECT antifreeze up to the fill line (There should be two lines - a "Hot" and a "Cold"). Find out where you are losing your antifreeze - look for a puddle under the vehicle after you fill it. If no puddle, run until the vehicle is warm, shut it down, and look for a puddle.
If your cooling system was empty, you may have to bleed the system after filling the tank. A shop manual for the vehicle should tell you whether you have to bleed the system.
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