I have a '99 Yukon with the 350 Vortec. I have a leak due to the quick connect coupling that attaches the heater hose to the intake manifold. I CAN'T BELIEVE how ridiculously STUPID this design is! A plastic retainer to hold the cooling hose in??? Anyway, on the manifold there's a coupling that screwed into the aluminum manifold. Inside the coupling there's a rubber boot that is supposed to seal the aluminum end of the cooling hose and a plastic quick connect retainer clip that's supposed to hold it in there. Well, the antifreeze is pouring out of there. I've already changed the coupling, the flimsy plastic clip and rubber boot twice already on 2 different occasions and it still leaks. There's got be a better, more permanent way to fix this. I'm thinking of just an aluminum threaded nipple with an old fashioned style hose clamp. I know that having 2 dis-similar metals would cause a reaction and possibly corrode so I'm assuming that what I'm looking for would have to be aluminum. Does anyone out there have a remedy for this that works? Thanks, Malo