Q: I came from work and thermostat was how it should be then I got home and turn the engine off but had the ignation on been off and

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My gmc started leaking antifreeze after I got home but I left the ignition on while engine was off can someone tell me if it's normal I turn it on and it's back on shape I just wanna know what's the problem if it's normal

My car has 170000 miles.
My car has an automatic transmission.

V8-8.1L
2005
leaks
coolant
GMC
Sierra 2500 HD
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