Radiator Cap Testing

Iroshana · October 12, 2008

Is there any method to test the radiator cap at home without using special tools?

I got a problem with radiator cap because it seems its allowing coolant to overflow when the engine is hot, but seems not facilitating coolant to return back to the raditor when the engine is cooling down. When I open the cap in the morning I can hear air flowing sound to radiator when the cap is loosen. It seems coolant not coming back to fill the vacuum.

Please let me know any comments please.

Ripper · October 12, 2008

Iroshana said:
Is there any method to test the radiator cap at home without using special tools?
I got a problem with radiator cap because it seems its allowing coolant to overflow when the engine is hot, but seems not facilitating coolant to return back to the raditor when the engine is cooling down. When I open the cap in the morning I can hear air flowing sound to radiator when the cap is loosen. It seems coolant not coming back to fill the vacuum.

Please let me know any comments please.

don't have the answer but i too faced a similar situ when my mechanic replaced the cap with a different pressure rated cap...

Just googled for my car make and model... got the psi number that's recommended by the manufacturer, got a new cap for that rating and job done

Iroshana · October 13, 2008

Ripper said:
don't have the answer but i too faced a similar situ when my mechanic replaced the cap with a different pressure rated cap...
Just googled for my car make and model... got the psi number that's recommended by the manufacturer, got a new cap for that rating and job done

Anybody know the correct pressure rate for 4DR5 engine? seems its not available on Google.

Ripper · October 13, 2008

Iroshana said:
Anybody know the correct pressure rate for 4DR5 engine? seems its not available on Google.

how about checking with the agents???

and another thing is that don't settle for even slight PSI difference between the original spec one and the one you're buying. I had put in a cap that was only few PSI's higher than the OEM rating and my radiator started leaking from the top Now even with the correct rating it still leaks a bit... something i gotta rectify soon

Edited October 13, 2008 by Ripper

Car Maniac · October 13, 2008

Iroshana said:
Anybody know the correct pressure rate for 4DR5 engine? seems its not available on Google.

Bro, I think you are asking about the Mitsubishi 4DR5 engine of your Jeep right? I will give you two suggestions to find out the solution you want because it seems like you still haven't found the PSI pressure rate from anywhere yet.

Option 1. You can call some Mitsubishi Jeep owners who have advertised their 4DR5 engined Jeeps for sale at Auto Lanka site and kindly explain them your situation and ask one of them to check out their vehicle's radiator pressure cap and let you know the correct figure. Because then the pressure value they tell you has lot of credibility because they are saying it after looking at the same 4DR5 engines. If you can visit one of them, then thats better ("Find it yourself" method). Im sure there will be atleast few guys who are willing to help you. Warning: Here the way you ask them matters a lot so be gentle in your words or get the help from a marketing guy.

Option 2. Go to Mitsubishi agents - Uni ### Mo and let them solve the problem. If agents dont know, then who else knows??? As far as I know, a pressure cap will not cost you more than 1000 rupees even in an extreme situation and your matter will also get solved easily. And this is the best solution too.

Wishing you good luck!!!!!!!!!!