ktm Posted June 16, 2011 Share Posted June 16, 2011 I've been researching this issue over at LS1tech.com for a few hours and there is no definitive consensus. One group says go ahead and block them off while the other state that you should loop them. To confuse matters, some folks state that as long as your t-stat has holes around the perimeter you can block the ports off, otherwise loop them. Looping them is the easy, quick, and "correct" solution, however, it is not aesthetically pleasing. I was going to tap the two ports (1/2 npt and 3/8 npt) and use flush plugs. What has everyone here done? Experience? Quote Link to comment Share on other sites More sharing options...
Zzeal Posted June 16, 2011 Share Posted June 16, 2011 Yep, tap and plug 'em. Looks good and works perfectly. Steve Quote Link to comment Share on other sites More sharing options...
Phantom Posted June 17, 2011 Share Posted June 17, 2011 Not sure how all heaters are set up but the ones I have personal experience with do not circulate the radiator coolant unless heat is called for. That, to me, is the same as having the ports plugged. Also, if the heater ports are looped then part of the water pump output is just looping back without doing any cooling. Don't see how that can be beneficial. Quote Link to comment Share on other sites More sharing options...
RB30X Posted June 18, 2011 Share Posted June 18, 2011 Mine are just blocked off. Quote Link to comment Share on other sites More sharing options...
ColtGT4g63 Posted June 27, 2011 Share Posted June 27, 2011 (edited) Some heaters have a heater control valve, which is closed (blocking the flow) if the temperature is not set to heat. Other cars will have coolant circulating through the heater core at all times. And just use the blend doors inside the climate box when the temperature is set to heat. If you're worried about it, loop it and kink the line. And when you verify for yourself that its not blocking the flow to the radiator, then pull the loop off and plug 'em! Edited June 27, 2011 by ColtGT4g63 Quote Link to comment Share on other sites More sharing options...
smoorenc Posted June 28, 2011 Share Posted June 28, 2011 The z heater core valve is shut unless heat is called for. Same as blocked Quote Link to comment Share on other sites More sharing options...
smoorenc Posted June 28, 2011 Share Posted June 28, 2011 The z heater core valve is shut unless heat is called for. Same as blocked Quote Link to comment Share on other sites More sharing options...
ktm Posted June 28, 2011 Author Share Posted June 28, 2011 I've decided to loop it for now but will test it out later to see if I can block them off. Thanks all. Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted July 10, 2011 Share Posted July 10, 2011 For me, Auto Zone had a loop of the correct size (5/8 to 3/4) on the shelf. Quote Link to comment Share on other sites More sharing options...
ktm Posted July 10, 2011 Author Share Posted July 10, 2011 RebekahsZ, thank you for the tip. I picked up my part from NAPA (part #10777). Gates makes all of NAPA's belts (per the guys at NAPA) and the Gates part number is 18777. The Autozone part number is Kelly-Springfield 4354; Dorman is #02253 and Dayco is B87629. Quote Link to comment Share on other sites More sharing options...
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