Kovalainen, 26, won from Toyota's Timo Glock with Ferrari's Kimi Raikkonen in third place.
"I'm delighted that Romain Grosjean will be beside Kimi next year, " team principal Eric Boullier said.
Finland's Kimi Raikkonen for Lotus completed a podium of world champions in third place.
Also in the title frame is Finland's Kimi Raikkonen, who is seven points behind the Briton.
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Coulthard's team-mate Kimi Raikkonen finished third, beating Montoya's team-mate Ralf Schumacher into fourth place.
Grosjean's teammate Kimi Raikkonen took fifth, ahead of the two Ferrari drivers Alonso and Felipe Massa.
The Brazilian has performed well above expectations this year, out-driving his world champion team-mate, Kimi Raikkonen.
Kimi Raikkonen lines up third for Ferrari alongside Renault's Fernando Alonso, who did well to qualify fourth.
If he did the chicane properly, he would never have crossed the line one metre behind Kimi.
Heikki Kovalainen in the second McLaren overhauled Kimi Raikkonen's Ferrari to take third place on the grid.
They needed to accommodate Alonso, but Massa and Kimi Raikkonen were both already under contract for 2010.
For marathoner Kimi Puntillo, the fateful volume was a reference book associated with a certain Irish brewery.
Vettel's Red Bull teammate Mark Webber was fourth with former world champion Kimi Raikkonen fifth for Lotus.
Hamilton increased his championship lead to five points from Ferrari's Kimi Raikkonen, who came home third.
Horner dismissed talk of 2007 world champion Kimi Raikkonen returning to F1 with Red Bull next year.
"We wish to thank Kimi for everything he has done during his time with Ferrari, " he said.
This immediately took the fight to Ferrari, and helped Kimi Raikkonen to a brilliant win in Belgium.
Kimi Raikkonen said a strike would "never happen, " while David Coulthard dismissed talk of a strike as rubbish.
Ferrari's Kimi Raikkonen was expected to pick up Michael Schumacher's legacy and ensure the prancing horse dominated in 2007.
We weren't competitive again, so to get third place in front of Kimi really was a result for us.
The result extended Schumacher's championship lead over McLaren driver Kimi Raikkonen to eight points with six races to go.
Lotus' Kimi Raikkonen and Sauber driver Kamui Kobayashi complete the top ten line up, finishing seventh and eighth respectively.
Hamilton's points advantage is the same as the one he held over Ferrari's Kimi Raikkonen heading into Brazil last year.
Force India's Paul di Resta secured an impressive fourth position ahead of Mercedes driver Nico Rosberg and Lotus's Kimi Raikkonen.
Hamilton won races in his first season, Alonso and Kimi Raikkonen did so in their first seasons with top teams.
Dennis said he was excited about the prospects of his new driver line-up of Kimi Raikkonen and Juan Pablo Montoya.
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Some adjustments to his car and tyres spurred a massive improvement and he starts sixth ahead of McLaren Kimi Raikkonen.
The Englishman was handed a 25-second penalty for gaining an advantage for cutting a chicane while battling with Ferrari's Kimi Raikkonen.
Ferrari's Kimi Raikkonen, who won the race, is now only 13 points adrift of Hamilton, with a maximum of 30 still available.
Its design tends to be gentler on tires and, as a result, Kimi Raikkonen and Romain Grosjean have performed better than expected.
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