Always depends on how deep you go and how your powerplant is engineered.
And how much load it's under.
And, of course, what type of star it is.
My Cutter always used to suffer from heat (I've changed the build now) but I mitigated the problem by disabling a bunch of modules when I was doing a significant amount of travelling in it.
Course, this isn't exactly the best time to suggest that.
+EDIT+
FWIW, my Corvettes have G4/G5 overcharged PPs, both with Thermal Spread and neither had any problems scooping (prior to the update, at least).
IIRC, they're both fitted with a 7A scoop, though, to minimise the time I need to spend getting toastie.