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Thanks very much for the reply and pics. I appreciate it. I posted this about 9 months ago and fixed the problem shortly after by making a permanent fitting with a brass hose barb and a clamps.

The truck has been great since I bought it used in 2002. I've only had to change the water pump (twice) but just last month the intake manifold gasket sprung a leak. I'm mechanically inclined so luckily I was able to fix it myself. That was a project though. It took me a whole weekend to...

Fixed it with a hose barb from Home Depot, a 5/8"-3/4" coolant flush connector, and some 5/8" and 3/4" hose. I will never leak again.

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...