Heater core replacement

[crusin242000]

I have now decided to replace my heater core. Simple and near completion. I have one question. Should I use some kind of adhesive on the firewall? I have the inner fender out so it will be easy to access the bottom bolts . Thanks in advance . Really a good group of knowledgeable guys on here.


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[yevgenievich]

If the engine bay side of the hvac stayed in place, should not really need to add anything

 

[PrairieDrifter]

On the engine bay side use 3m strip caulk. I just did a heater core on my suburban. I used foam tape on the inside and I did a little extra and put some regular silicone around the inlet.

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[Old77]

I've moved this to a more appropriate subforum

 

[crusin242000]

If the engine bay side of the hvac stayed in place, should not really need to add anything

It was taken out by a shop(hvac) what should I use to seal that opening ? Thanks


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[yevgenievich]

As was mentioned strip caulk, silicone and foam tape depending on exact sealing surfaces would work.

I had used just silicone and foam tape before just to get going with ok results. Strip caulk is the correct way to seal around on the engine bay sides and where evap core lines come in.

It was taken out by a shop(hvac) what should I use to seal that opening ? Thanks


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[crusin242000]

Okay . Just received the 3m strip caulk. Preparing before I start reassembling. Does anyone have recommendations on the fasteners? The nuts that came from the factory are almost all dinged up and not reusable. Should I go stainless or any suggestions would be greatly appreciated here. Thanks


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[Snoots]

Zinc coated should be fine. Splurge on SS if you like.

 

[crusin242000]

Zinc coated should be fine. Splurge on SS if you like.

Okay so just a regular washer or maybe a lock washer ?


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[PrairieDrifter]

Okay so just a regular washer or maybe a lock washer ?


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As long as the studs are still on the heater box inside you’re fine. A flat washer will do just fine, I like to use lock washers too, but that’s just me, you don’t really need them for this job

 

[crusin242000]

As long as the studs are still on the heater box inside you’re fine. A flat washer will do just fine, I like to use lock washers too, but that’s just me, you don’t really need them for this job

Thanks! Do you know what size nuts / thread pitch to buy? Hate to ask so many questions, but you guys sure help me out !


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[PrairieDrifter]

Thanks! Do you know what size nuts / thread pitch to buy? Hate to ask so many questions, but you guys sure help me out !


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I believe it’s 1/4-20

 

[HotRodPC]

I've moved this to a more appropriate subforum

Lookatchoo !!! Doin' Work !!!

 

[radio2000]

Does anyone know of a step by step on how to replace the heater core?
My 89 Burb is in need...

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[CRM]

Youtube