1995 Chevrolet Truck - Heater Hose Connections and Hose - while recently troubleshooting leaks (occuring at both of the "quick disconnects"), I broke the one at the back of the engine on the intake manifold

1995 Chevrolet Truck - Heater Hose Connections and Hose - while recently troubleshooting leaks (occuring at both of the "quick disconnects"), I broke the one at the back of the engine on the intake manifold

1995 Chevrolet Truck Heater Hose Connections and Hose

The design of the water supply to the heater core on this truck is the latest and by far the strongest reason I love Japanese cars. While recently troubleshooting leaks (occuring at both of the "quick disconnects"), I broke the one at the back of the engine on the intake manifold. I broke this device while squeezing the plastic retainer clip ears.

The metal had obviously weakened with age or corrosion. Why are the heater core hoses connected by such a complicated, expensive, trouble-prone and "professional service only" system. When I first found a leak at the front water pump connection, I went to auto supply houses to buy the o-ring inside the coupler assembly. The metal parts can't go away, right? The rubber does the sealing, right? No. Nobody offered such, only the whole coupler device. Oh yes, the o-ring was a proprietary size.

So, I thought I would work around the great engineers at GM and just buy 5/8" hose to 1/2 NPT nipples and do it the old fashioned way that has always worked so well and is so inexpensive on most of the other vehicles on earth. Well as I investigated further, I found that GM had made the hoses two different sizes. The front one an odd size slightly smaller than standard 5/8" marked as 15.1mm. The other hose is slightly larger than 5/8. I haven't tried to find these hose sizes.

I expect problems there too. The nipples from the heater core are matched to these hose sizes and to get a leak free connection I'll probably need the "correct size." I have access to a machine shop and I will overcome all this.

Writing this I have answered all the questions I have listed here. It's plainly obvious. It's all a left wing conspiracy requiring Mr Goodwrench for certain and often. This is my first GM product. This is my last GM product.

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