The 20-year-old New Zealander stepped up Australia's premier touring car series last year but ended the season sitting on the sidelines after Super Black Racing handed Chris Pither the drive for the final two rounds.
Pither was subsequently confirmed as his permanent replacement for 2016 prior to the final round at the Coates Hire Sydney 500 in December.
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While eager to explore the discipline, the Auckland driver, who has been linked to the vacant seat at Lucas Dumbrell Motorsport, believes he has unfinished business in V8 Supercars.
Heimgartner recorded a best finish of seventh at Sydney Motorsport Park last season.
“It has been a bit of a rollercoaster over the past two years and this year I have a different opportunity in Australian GT which I'm looking forward to,” Heimgartner told Speedcafe.com.
“I didn't want to leave (V8 Supercars) and I would have liked to see out the season.
“Super Black have done so much for me and I wouldn't have been in Supercars without them, so I can't really point any fingers there.
“I do have unfinished business. It was my rookie year but I think I did pretty well and proved a lot of people wrong and V8s is where I want to end up again but lets just see how this year goes.
“We have been talking to Lucas but I don't think I will be on the grid this year, but we are pushing hard for next year.”
Heimgartner will contest the remaining four rounds of NZ Touring Car Championship beginning at Ruapuna on January 16-17.
The Kiwi will kick off his Australian GT campaign on the Adelaide streets at the Clipsal 500 held from March 3-6.