Surge tank replacement

WRENCHERHEAD

MEMBER
1996 CHEVROLET CAVALIER
2.2L
4 CYL
2WD
AUTOMATIC
138,000 MILES

The first design tank with one vent tube is discontinued from GM and aftermarket so I had to buy the second design tank that comes with two vent tubes. I have temporarily capped off second tube with vac caps, one that fit tube dia and then another cap to fit over first cap and secured with hose clamp since they're soft rubber but I'm not confident they will stand-up to 15 psi, the heat or ingredients of coolant. Would plastic welding the end of tube be sufficient or do you have a better suggestion? Thanks

4 Replies

JACOBANDNICKOLAS

MECHANIC
109,700 POSTS

Welcome to 2CarPros.

What diameter is the hose you used? Is it something you can get in high pressure fuel line? That will hold the pressure easily. The plastic cap you used should be fine.

Let me know.

Joe

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Friday, June 14th, 2019 AT 9:52 PM

WRENCHERHEAD

MEMBER
34 POSTS

Hi Joe. There is no hose involved. Again I have the first design system which incorporates one vent line. Since that tank is no longer avail from GM or aftermarket I had to purchase second design tank which incorporates two vent tubes (second design 1997 and later). I don't have that set-up so I had to block off the second tube and the caps I used are soft pliable rubber caps not plastic. That's why I wanted to know if I used my plastic welding kit to seal off the end of the tube. The welding tool has special tip to do a clean job of melting end with different composite welding rods (ie: ABS, PVC, etc.) That would give much more confidence to be a permanent fix instead of the soft rubber caps. Please let me know if you have a better suggestion. Thanks Wrencherhead

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Saturday, June 15th, 2019 AT 1:09 PM

JACOBANDNICKOLAS

MECHANIC
109,700 POSTS

Welcome back:

Now I understand. Sorry about that. Honestly, I think your plans sound great. You just need to make sure there are no leaks. I have seen the product you mentioned, and if you can do it in PCV, I can't think of a better way of doing it.

Let me know how it works out for you.

Joe

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Saturday, June 15th, 2019 AT 5:40 PM

WRENCHERHEAD

MEMBER
34 POSTS

Thanks Joe on your timely response and for the compliment on my idea plus letting me know to use PVC to weld the end closed. I must have searched for an hour or so trying to find out what material the tank was made from. Again, thanks Mark

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Saturday, June 15th, 2019 AT 7:51 PM