Quote:
Originally Posted by ls1nova71
At which time you will go right back to blocking them off...... The way I understand it, which may or may not be right, is the system was designed the way it is for faster warm ups to help with emissions. Once the cooling system is full, it shouldn't matter. When you put a Vintage Air set up on it, whenever the A/C is on, the heater hoses will be blocked off by the heater control valve, essentially blocking the same ports off. I've personally put well over 200k miles on LS swapped vehicles with this same set up and never had an issue, most of which miles were put on in the heat of the summer with the aircon on.
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There is a big discussion regarding that on ls1tech, isn't there. Some guys put that pre-heater bypass loop in, others say its not necessary. I went your route. Leave it (without) until I see a need for it.