str8pipez Posted January 5, 2015 Share Posted January 5, 2015 I know I had this info at one time but can't find it to save my life. Which heater core fitting, top or bottom goes to which fitting at the LS1 waterpump. Does the 3/4" go to top fitting at firewall or bottom? Thanks. Quote Link to comment Share on other sites More sharing options...
EastTnZ Posted January 6, 2015 Share Posted January 6, 2015 Front hose on the water pump when in the car goes to the passenger side on the firewall. I had to get a 3/4" to 5/8" adapter and put 2 hose clamps on the transition. I have a gen iii 5.3 FYI Quote Link to comment Share on other sites More sharing options...
str8pipez Posted January 6, 2015 Author Share Posted January 6, 2015 On 1/6/2015 at 4:51 AM, EastTnZ said: Front hose on the water pump when in the car goes to the passenger side on the firewall. I had to get a 3/4" to 5/8" adapter and put 2 hose clamps on the transition. I have a gen iii 5.3 FYI Cool, that's how I have it. Thanks! Quote Link to comment Share on other sites More sharing options...
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