Radiator cap gasket

The filler neck looks fine to me. Can you get a pic of the cap?

 

God. Just go buy a new cap already you cheap bastid! It will come with a new gasket, You threw the old broken one away.

Me, Pulling out hair!

 

My advice to you is to go away as you're clearly not helping

 

Yes. I do indeed.

I also find this thread quite amusing. Esp the OPs attitude.

 

Why are you such a hater? I'm asking questions. Some people are helpful. You're not. If you don't like what I'm asking, go away. It's my truck.

 

Just buy a new radiator cap man. You're making it more difficult than it needs to be.

 

Doording is a mod now? Finally, some new info in the thread.

 

I think there is a problem with the generic cap adapter for the testing kit and it doesn't seal it airtight. Here is why I say this:

When I realized that the testing kit hose fits around the resi tank fitting that's right near the top of the opening below the cap, I put the actual cap on and pumped it through there and WAS ABLE TO PUMP IT TO 10 psi (or higher but that's where I stopped). The testing kit adapter was leaking. The cap doesn't, which explains the inability to pump with the tester kit adapter.

When the pressure in the system was 10 psi and I would squeeze one of the two big hoses that go from the rad into the water inlet, it would increase the pressure to 11 psi, releasing it would go back down to 10.

Now I left it pumped up and will go get some coffee to see if the pressure will lower over time.

The one problem with this approach is that it's not testing the part of the system from the nozzle that I macgyvered for pumping to the resi tank. That's why I will get just a special Toyota cap testing adapter and try to fit the hose of my testing kit over it to test the whole thing. While the pump of my test kit is ok, the adapter is not making a good seal.

Also, i don't think the problem was in the old cap either as I pumped the system with both the old and the new cap through this backdoor nozzle and both are holding right.

 

Staff or not, foam pile is trying to fix His truck. Telling him to go to dealer, which may cost him much more money than new parts he put in his older truck is let's just say silly. None the things he replaced he would not have to do soon anyway. Toyota dealer would not even troubleshoot. They would replace radiator, water pump, thermostat and fan clutch, just because one of those things would fix a problem. $2000 later maybe cooling would've have work. In the meantime guy is getting crash course in cooling. So either support it or at least don't crap on his effort.
He did not put oil in his radiator yet, so he is not doing that bad.

 

Thank you, BlueT. I have always fixed everything I tried , from vehicles to domestic construction. I have never failed given long enough a time frame to learn. I have built a whole house, including plumbing and electrical, as well as successfully completed numerous automotive fixes, saving me 1000s of dollars.

But I frequently run into new situations and need to learn new things (such as the cooling system). When I post on QA forums line this with a question about a functional domain I am new to, a usual cohort of haters laugh at my purported incompetence and suggest I get professional help, which I almost never do. Until I acquire enough knowledge, I may sound like an idiot to haters whose assumption is that k knowledge is something you're born with and not acquired, so my case is therefore hopeless. But over time, useful people like yourself and Nirvana get me up to speed and I succeed in my pursuit.

My theory is that such arrogant haters, in which this site abounds, have this attitude for various reasons. One is so that they can feed their overinflated egos as they see themselves as possessing expertise unattainable by others. Another is that they discourage DIY because they want to stimulate revenue to their fellow pros. There may be more reasons.

Thanks again for being one of the few actually helpful ones

 

Oops. I missed that - my morning coffee hadn't taken full effect I guess.

 

If you were pumping thru the reservoir then that only checks the outer seal of the rad cap and not the inner seal that does the actual pressurizing of the system. It is the one that opens and closes to keep proper pressure in the cooling system and the one most likely to fail on the cap and cause your symptoms. You can't check that seal with the tester you have.

 

If you want to test whole system, you are better off connecting pump to the line that runs into the oil cooler (under oil filter), than just plug other end and apply air pressure there.
Radiator cap should open at 17 PSi, (No more than that because it will start blowing head gasket) So if you start pumping you should see pressure climb to 17 psi and than stay at that. Put some dish soup on tube coming out of res tank to see air coming out.
Anything bellow 11 psi means its bad cap or bad head gasket. So if your cap holds only 11 psi than its garbage. I would not pressurize res tank because its not made to be under pressure. Hope that helps.

 

Say what????

 

All I am sayign to test properly cap with out a special tool, he needs to pressureize cooling system. the easiest entry point is through the oil cooler which is right under oil filter. Second good spot is hose supplying cabin with coolant. either way it will work to test cap pressure. otherwise he needs special Toyota tool to do it and I don't think he wants to spend that much money (I would not).
On the end its probably cheaper and easier to toss new cap.

Yeah I dont know whats some people problem. Funny thing is I know couple ASE certified mechanics who struggled as hell trying to troubleshoot their own truck cooling. Its not that they had no skills, They are probably some of the best mechanics out there, but cooling system and electronics are two very hard to troubleshoot items. There is usually no sound to help you, and there is nothing visual to help out.
More than likely they never had done this so they think its easy, and its not.
I understand where you coming from, all I can say ignore these folks and continue.