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ok thanksThat was proven not to work years ago, different versions show up every few years...
The heater control valve could come on any of them. My 99 tahoe has one on it. And the valve is a bypass, not a shut off, it actually flows better than the heater core does.GMT 400 series with 6.5 TD option heater cores constant flow my 99 GMT 425 has dual heater cores in constant flow heater cores no heater hose shut off valve (s) like the earlier ones had.
As always I stand corrected about shutting off "thanks FERM" my brain fa_ts do get the better of me at times.The heater control valve could come on any of them. My 99 tahoe has one on it. And the valve is a bypass, not a shut off, it actually flows better than the heater core does.
As to the paradox system, there was some testing done thst proved it actually made things worse by inducing flow blocking reversion. Heath's kit at least had a spring loaded valve so that it only opened at higher rpm's. You're still better off to run the spin on fan style balanced flow pump.