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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Dec 2007 Posts: 79 'Bolter | | 'Bolter Joined: Dec 2007 Posts: 79 | had an old round core in my 55.2 just got a deluxe heater to install, I did a search, and I know this has been covered before, so I'm sorry, but now I have a 5/8 and a 3/4 heater hoses,which one goes to the pump and to the intake manifold???,and again sorry,[before both were 5/8 and no heater control valve] Thanks This is a 55.2 with a 265 | | | | | Joined: Jul 2001 Posts: 3,887 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Jul 2001 Posts: 3,887 | AFAIK they should be the same size [5/8], someone must have mixed parts of car and truck heaters - see here, sheet 3, you want the one closest to the fender to the pump and the one towards the engine to the intake - providing the core is correct and correctly positioned Bill | | | | | Joined: Aug 2005 Posts: 6,377 Ex Hall Monitor | | Ex Hall Monitor Joined: Aug 2005 Posts: 6,377 | I don't know which way is "correct" but it should make no difference which way since all that happens is coolant circulation. I'd think that if you just connect them the way that pleases you, you should be OK. I'm sure that if I'm wrong someone will point it out.
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| | | | | Joined: Jul 2001 Posts: 3,887 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Jul 2001 Posts: 3,887 | Tiny - it makes a minor difference with the Ranco temp control valve - the factory install results in the incoming hot water being shut off where it enters the core rather than where it leaves, and allows the temp sensing tube to control the Ranco properly
Bill | | | | | Joined: Dec 2007 Posts: 79 'Bolter | | 'Bolter Joined: Dec 2007 Posts: 79 | Thanks Bill everythings fits, but the new heater valve is 5/8 and the core pipe is 3/4 which is closest to the fender the heater control valve is next to block,thanks for the diagrams, you just cann't tell which one is the valve side but I'll go with the pictures it may be a different core, but fits like a glove. Thanks | | |
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