Stupid Radiator capped off extra part keeps leaking

In the pic here you can see the capped off part right below the cap. On cold start up it keeps dribbling some fluid. I have tightened it down some but now that fluid has got past it the whole rubber part MOVES. So I need to take it off and dry the inside of it and clean off the part it is on to get it to clamp on and STAY tight. This thing is annoying. I am afraid it is just going to blow off.

 

What does the actual tube fitting look like? Is there a rib or bump?

 

I have not taken off the rubber cap yet. Not sure if there is a rib or bump. I was not expecting to deal with something like this.
Why?

 

Quite often those caps fail.
Get a new plug/cap and clamp and that should solve things for now.
Change it out yearly

 

Looks like the clamp may not be in the ideal location and possibly too wide. That's why it leaks.

 

ideal location back as far as I can get it?

 

Look at the end of the cap they tend to split. Give it a squeeze you will be able to see them generally if they are there.

 

This thing is new. The cap is still a nice rubber feel to it. Not hard or like that. Just seems when cold it is letting fluid out at the back side of cap nearest to the rad. You can see a tiny stream coming from the bottom side of it. Seems once the car is up to temp the plastic it is on expand then it seals. I drove the heck out of it last weekend, no leaks. Even today it was just a very very small drip leak. Just scares me the damn thing will just blow off. ha ha ha

 

Try putting a little old fashioned gasket cement (the king that comes in a glass bottle with a dauber attached to the cap) around the radiator fitting before clamping the cap. Make sure you clean the inside of the cap and radiator fitting first.

UticaGeoff

 

On my old rad like that they lasted about a week before cracking.

 

Those things will blow apart. Get a piece of heater hose and a large bolt and two hose clamps.

 

If I'm looking at the right thing it looks like the trans cooler connection. That should have an internal threaded boss that could take a proper plug.

If I'm right that begs the question - are you using an external trans cooler? Nothing?

Of course it's early and I'm low on caffeine so I may not know what the ^&%% I'm talking about

Bob

 

I've ran the plastic tank rads for years now without any issues,..its a very small problem if one was to even consider it a problem. The caps are notorious for cracking,..just what they do,..take a small section of hose as suggested and put a recessed pipe plug in the end then double clamp it.

Option 2 take a piece of round plastic or aluminum stock from the the hardware store turn it down to very light press fit,..coat it with jb quick or permatex and tap into place,..no hose no clamps no problems

 

Trans lines are metal and the are connected below the part/location I am talking about.
I guess I will get some reg hose and clamp it off that way.

 

Put a short section of heater hose on there with a bolt in the end to plug it with a hose clamp on either end. Fixxed.

 

You have to be careful tightening those clamps on plastic, if you tighten them too much, they can crack the plastic.

I think Hugger, Steve, and Mr Sony have the right idea with the plugged hose. It might look like crap, but it won't rot off.

 

yea I will go to the hose plug off but yea it looks like crap.

 

If you use a longer piece of hose and tuck it under somewhere it would at least look functional

 

Why would you guys run a plastic radiator anyway?
Originals are metal/ brass.

 

Plastic/aluminum about $90, brass/copper about $400.