CUTLASS Heater core replacement question

[rfpowerdude]

I have a new heater core that I am going to install. However, it came with some foam that I am not sure is necessary. Should this foam be installed? If so, how? Wrap it around the perimeter? Or just toss it? I don't remember there being anything in there when I took the old one out...

 

[MrSony]

Wrap it around. It cushions the heater core. Make sure the V shape on top isn't wrapped over for the hold down bracket.

 

[oldsofb]

The foam goes on the ends (Left and Right) and it's held by the ridges.

Hutch

 

[rfpowerdude]

Thanks guys!

 

[gp471]

in the aftermarket world of mis fits you use foam to stop air going around the core.a half inch gap can kill your heat when temps are in the teens.

 

[rfpowerdude]

in the aftermarket world of mis fits you use foam to stop air going around the core.a half inch gap can kill your heat when temps are in the teens.

Fortunately, I won’t have to worry about temps in the teens here on the SpaceCoast…🥳

 

[Ugly1]

If (and it does happen!) you get a whistle sound after the install it’s the fluid going through to fast or there is a small amount going between the two sides. ( I was never told exactly which) but there is an insert that goes in the hose like a reducer and helps eliminate the problem. Even the factory did this!