Sealing ac/heater box - changing heater core

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HyperV6

Member
Joined
May 5, 2004
Messages
538
I need to change my original heater core in my car. What is used to re-seal the ac/heater box and the mating firewall area near the windshield? Do you use 3M strip calk for all sealing? I just hope to prevent any water leaks especially at the firewall / windshield area.

Any tips on getting the top cover off the ac/heater box?

Thanks for any suggestions, Craig
 
You can use Permatex black silicone sealant or even strip caulk for the heater box to firewall area. Both work well.
 
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