im not gonna lie. when i did my heater core in my 89 lx i just used a screw driver to see if there was any refridgerant. I was lucky there was none in it a

. I was getting ready to drive it to a shop with no dash or consles just to get it removed. But i figured it didnt work so there was nothing in it and might as well check. Not telling you to do that its enviromently unfriendly but a way to see if there is any in the system.

p.s never do a heater core in a fox haha.
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