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I am having terrible leaks coming from firewall area on 66. Seams like it may be around heater core box on pass side, and I don't know where on drivers side, but they are pretty significant. Has anyone experienced this, and how to fix? The insulations (whats left anyway) gets soaked and drips to floor boards. I put silicone around some places I thought were the problems, but no luck. And getting the heater core cover off from firewall underhood looks like I will have to take inner fender off. Any tricks? Any advice? Thanks in advance........leaks suck