Heater Core Leak - ZR-1 Net Registry Forums

dremorse · 04-30-2022

Leaky heater core on 1991. Thinking best bet for now is to bypass the core. Asking for guidance on making sure I tap the right hoses and any other suggestions. Thanks!

Young1 · 05-01-2022

Interesting I just bypassed my core last night. Go to Lowe?s and purchase two 3/4 inch barbed elbows in brass and four hose clamps. Then go to auto parts and buy a foot of 3/4 heater hose. Drain a gallon of anti freeze. Remove the two lower hoses from the expansion tank. Leave the small hoses connected at the radiator cap neck. Remove the tank and move it out of way. Now you can see the upper and lower heater core hoses to connect your 180.

secondchance · 05-02-2022

zr1.net/forum/showthread.php?t=32315&highlight=heater+core

I replaced a heater core on dregeguy (Charlie's) 92.
If NCRS perfection is not a must, cutting the heater core tubes just long enough to slip on a hose and clamp will make the job somewhat simpler. Otherwise, console, radio bezel, instrument cluster, and finally the dash pad have to be all removed and and the fasteners bagged and labeled.

04-30-2022	#1
dremorse Join Date: Apr 2022 Location: Waynesboro, VA Posts: 5	Heater Core Leak Leaky heater core on 1991. Thinking best bet for now is to bypass the core. Asking for guidance on making sure I tap the right hoses and any other suggestions. Thanks!

05-01-2022	#2
Young1 Join Date: Sep 2016 Location: Ocala, FL Posts: 902	Re: Heater Core Leak Interesting I just bypassed my core last night. Go to Lowe?s and purchase two 3/4 inch barbed elbows in brass and four hose clamps. Then go to auto parts and buy a foot of 3/4 heater hose. Drain a gallon of anti freeze. Remove the two lower hoses from the expansion tank. Leave the small hoses connected at the radiator cap neck. Remove the tank and move it out of way. Now you can see the upper and lower heater core hoses to connect your 180. __________________ Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much.

05-02-2022	#3
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,727	Re: Heater Core Leak zr1.net/forum/showthread.php?t=32315&highlight=heater+core I replaced a heater core on dregeguy (Charlie's) 92. If NCRS perfection is not a must, cutting the heater core tubes just long enough to slip on a hose and clamp will make the job somewhat simpler. Otherwise, console, radio bezel, instrument cluster, and finally the dash pad have to be all removed and and the fasteners bagged and labeled.