The host of the Channel 5 series won Big Brother 2 and also the Ultimate Big Brother series when the show was on Channel 4.
"I want to go into the house, but they won't let me in. They won't even let me in the diary room! They won't let me in the house!" said Dowling.
"I'm hoping this year, they'll actually send me in because it's on Channel 5. It's a new show. They've made it younger-ish by revamping it. I think we can kind of do anything and get away with it. So I would like to go into the house and do something with the housemates that are nominated."
He added: "One of my favourite tasks was Ignore the Obvious when Marcus went into the house live when it was on Channel 4. So I'd love to do something like that. I'm just obsessed with going in the house."
Watch a video of Digital Spy at this year's auditions below:
Big Brother house tour - In Pictures: