Then it seems logical that the valve is not opening fully. Check the heater temp linkage too to be sure the cable is moving sufficiently. There's not much to a heater core when you think of it: unless it is clogged due to old age, liquid just flows through it. Your '62s core is new so no issue there. Gary H. > -------Original Message------- > Gary > Everything is new/rebuilt and pressure tested > Hoses are routed as shown in the links > My guess is the control valve is stuck, will keep you posted > Thanks > Mark > -- -- -- Please address private email -- email of interest to only one person -- directly to that person. That is, email your parts/car transactions and negotiations, as well as other personal messages, only to the intended recipient. Do not just press "reply" and send your email to everyone using the general '62-'65 Clubhouse public email address. This practice will protect your privacy, reduce the total volume of mail and fine-tune the content signal to Mopar topic. Thanks! 1962 to 1965 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_disclaimer.html. -- You received this message because you are subscribed to the Google Groups "The 1962 to 1965 Mopar Mail List Clubhouse" group. http://groups.google.com/group/1962to1965mopars?hl=en. --- You received this message because you are subscribed to the Google Groups "The 1962 to 1965 Mopar Mail List Clubhouse" group. To unsubscribe from this group and stop receiving emails from it, send an email to 1962to1965mopars+unsubscribe@xxxxxxxxxxxxxxxx. To view this discussion on the web visit https://groups.google.com/d/msgid/1962to1965mopars/20191126133240.8209.qmail%40server309.com.