Heater hose size 2002 Regal

Yes I know it seems simple enough but I never had time to take off the hoses. I went to AutoZone to order them. I thought both was 1/2" inside. However AZ looked up the heater core and it shows one end to be 5/8". So they are saying one hose is 5/8 and one is 1/2. They look the same size to me is the reason I'm checking here.

Thanks, Rod

They look the same to me too on both my '99 LS and '01 GS Regals. 5/8" is pretty standard for GM heater hoses.

I went ahead and took off both hoses at one end, they both are 5/8", thanks for your help.

Rod

Thanks for the feedback. Good to know. I sure hope it is 5/8". Reason why is I checked the fittings I used for the flush tee connector in one of the Regals and the one I have installed is the 3/4" tee. I believe the 5/8" tee was too small. The Prestone Kit came with 1/2", 5/8" and 3/4" tees with the clamps. The 5/8" did not fit right for some reason. Maybe it was changed in the 2002 year. :dunno:

I have an addition. Since my last post I bought both hoses from the dealer. The local auto parts stores just did not have them pictured correctly.

The hoses are 5/8" at the engine but the lower is 3/4" at the heater core . The upper is 5/8" at both ends. At the heater core end they are labeled, on the hose, LWR core and UPR core. GM inlet/lower #10427568 and outlet/upper #10427571. The lower at the core is the upper on the engine and upper core is lower on the engine. Hope this helps others.

Rod

Thanks for the update. Yeah I found out the same when I recently replaced the heater core in our '99 LS. The bottom port (pressure) at the heater core is definitely bigger at 3/4" versus the top (return) which is 5/8". See pics.


http://i5.photobucket.com/albums/y186/lizzywiz/DSC05688.jpg


http://i5.photobucket.com/albums/y186/lizzywiz/DSC05689.jpg
Delphi Heater Core HC0379