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New coolant tank cap

4565 Views 7 Replies 7 Participants Last post by  tdc
Well I decided to splurge the 11 dollars and just get a new coolant tank cap.

I have attached a picture of the old (left) and new (right) the old o-ring was compressed a lot and pretty much flat all around.

I have driven with the new a couple of days and when I open the hood after I stop and turn the car off the coolant odor seems to be less. I bought some o-rings from the o-ring store and will be putting a new one on the old cap. I don't think anything is wrong with the old cap besides having a compressed o-ring. So I will put a new o-ring on it and keep it in a zip lock baggy for now. I wonder how the o-rings get so flat.
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I think it's time for me to purchase some more orings as well.
mine also looks just like the one on the left. looks more like a box shape than an O shape.

Is it just me, or does that cap on the left, look like it also has sharp edges on the left side, at the threads?
What seems to be the lifecycle of these O-rings? Might have to consider a higher temperature tolerant material. I am assuming that they are Nitrile or Natural rubber.
What size o-ring?
I have to go look but I just used the new o-ring that came with the new cap. There is a thread on here about buying them from the
I think it's time for me to purchase some more orings as well.
I may jump in on this too. What thread was this in again?
¿Is it my imagination, or is the new one look smaller than the orig? ¿Did you try the new one yet, and did it fit nice and snugly like the orig cap (seal against inside of the bottle neck)? The reason I ask is because I had to replace my orig cap (that fit so snugly against said bottle, screw top separated while trying to take off to add fluid). And the new AC Delco (p/n 13502353), fits so so loose fitting, I can spin the cap/plug with very (too) little effort. (I don't know if this will hold back 20 psig). So, just seeking other's experience/input. I've also commented in the following thread:

My thanks for any comments/suggestions. tonyd.
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