The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Overheating- all of a sudden

**69TowRig** · 01-09-2008, 01:41 AM

Well you beat me to my suggestion, I think your cap was failing. The cap is vital to the operation of the cooling system because it allows the water to build up pressure. High pressure water can take more heat before boiling off. If the cap goes bad then the pressure does not build and instead the temperature rises instead. Since the water expands the only place it can go it out the now inoperable cap, once it hits ambient air it turns to steam.

01-09-2008, 01:41 AM	#34
69TowRig Senior Member Join Date: Jan 2005 Location: Raleigh, NC Posts: 897	Re: Overheating- all of a sudden Well you beat me to my suggestion, I think your cap was failing. The cap is vital to the operation of the cooling system because it allows the water to build up pressure. High pressure water can take more heat before boiling off. If the cap goes bad then the pressure does not build and instead the temperature rises instead. Since the water expands the only place it can go it out the now inoperable cap, once it hits ambient air it turns to steam. __________________ -Chris Building a stripper, one part at a time: 1969 K5, 307, 3spd, 3 seats, hard top. Added Pwr Discs, Pwr Steering, Aux Battery, T-case Skid, Lighted Sidemarkers, HEI, Lock-Right Diff, ECE Class IV Hitch, 32" MT/Rs. Parts to Install: Hand Throttle, Console, Tow Hooks, Dual Horns, AM-FM, Dealer Swing-Away Tire Carrier, Gas Tank Skid. Also building a 1950 Willys CJ-3A and off-roading a 2001 Nissan Frontier on 1-Ton Portals...