JK Heater dramas

[Johnboy]

So Jeep has been parked for the last 2 weeks fired it up idled for about 5 mins AC was on jumped in, its cold here in SA so spun the heater knob round to "OH SO TOASTY", bam smacked in the face with the smell of hot coolant turned back to cold smell gone back to hot smell back.

My guess was leaking heater core??
Carpets arent getting wet no obvious signs of a leak??
Is this common? how hard are they to remove? what else could it be??

Cheers JR

[Rock an]

Really cant help you much but You didn't change from recirculating to fresh Air or something.

[Johnboy]

nah just hot to cold i'll investigate today maybe a leaking hose or worst case leaking core should take more than a few hrs to pull it out

[supersmalls]

I had that smell after changing coolant recently and performing a flush. I dont think it has leaked yet

[Johnboy]

had a good look under the dash and there are no signs of a leak not looking forward to pulling out the heater unit looks like a prick of a job