My 2004 GT2 has a similar issue and has been in the shop for it. The GM guy told me if it doesn't come on it could be a programming fix, if it comes on then goes off in a few minutes later thermistor / element problem.
The heater light/s will stay lit for about 5 - 10 minutes then just shut off on mine so, they ordered a part and I'm still waiting for it. I'll let you know what it is when they install it.
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Grand Prix GT2 2004
ZZP Z7 Turbo Kit 62-1, BC, 42.5# Injectors, LT1 MAF, 160 tstat, A/A IC, BOV, 3" ZZP SS Exhaust /w cutout, GMPP Handling kit
339.2 WHP 358.6 WTQ @ 13 PSI (zzp's mustang dyno)
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