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**wesmigletz** · 10-06-2018, 10:07 PM

The heater core on our 70 Blazer has the 3/4" outlet on the bottom and 5/8" on top.

IIRC, the 3/4 goes to water pump and 5/8 goes to the intake, with the hoses crossing over. Will it hurt anything if the 3/4 heater core is on the bottom, and I run it to the water pump? It's my understanding is that if you switched the intake and water pump fittings, the heater wouldn't get hot.

Thanks in advance.

Wes

10-06-2018, 10:07 PM	#1
wesmigletz Senior Member Join Date: Feb 2009 Location: Parker, Texas Posts: 685	Can a heater core be installed updise down? Effects? The heater core on our 70 Blazer has the 3/4" outlet on the bottom and 5/8" on top. IIRC, the 3/4 goes to water pump and 5/8 goes to the intake, with the hoses crossing over. Will it hurt anything if the 3/4 heater core is on the bottom, and I run it to the water pump? It's my understanding is that if you switched the intake and water pump fittings, the heater wouldn't get hot. Thanks in advance. Wes __________________ 1970 2WD K5 1968 Camaro Conv 1967 Chevy SWB 1964 Malibu SS 1957 Corvette Pics www.picturetrail.com/wesmigletz