Sealing Evaporator core box

[bigge31566]

Im replacing the evaporator core and wanted to know what you guys used to seal the box back up especially aound the tube exits and against the firewall

 

[89Suburban]

I used Sikaflex 1A caulk on mine for that and as a seam sealer.

 

[bigge31566]

where do you find it

 

[chengny]

The factory applied sealant is a 3M product called Strip-Calk (the misspelling is intentional). Comes in a box of 60 strips X one foot:

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Available at most auto parts stores. For example, Napa carries it as Part Number: MMM 08578. Like $28.

It can be easily shaped to the contours of the box and will stay firmly in place during installation.

This is also a great product to seal the gaps between the evap box and liquid/vapor lines. Much neater than silicone. It can be formed into rings and stuffed into the gaps - usually takes 2 rings.


NOTE: Whichever product you ultimately choose, when you do the box-to-firewall sealant don't forget to apply a strip to the face of the division plate that separates the blower suction/discharge sides:

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