So ive been trying to find out the cause of a coolant leak on my 92' fd. One warm summer day when i pulled in the driveway, coolant started spraying everywhere. I left the problem for a few months and am now completely lost. When i add coolant, it will immediately leak straight out the bottom of the car. Its not leaking from the overflow tank, or around the radiator and the upper coolant hose attachment is not cracked or leaking.

Anybody have a place i can look next? I was going to take off the front undertray to get a better look, but im still learning the ins and outs of the fd. Any advice appreciated!

 

lower rad hose or rad drain plug

 

Remove the under tray and look for the leak.

Radiator, hoses, air separator tank, are all likely suspects

Keep in mind your car is more than 20 years old and anything could be wrong.

 

Yup, taking off the under tray is easy and will probably show you the issue

 

Most auto parts stores have a radiator/coolant system pressure tester that you can attach to the filler neck on the thermostat housing to pressurize the system and expose any leaks. Easiest way to find a leak.

 

If you have the stock twins it's very common for the coolant lines behind them to just rot apart. They are small and hard to get to so are usually neglected until they completely fail.

 

If you don't want to go underneath the car, remove the intercooler and the duct and you will pretty much see all the hoses. You might need a flash light for some of the corners. Plus, this will give you chance to wipe down some of the parts and keep that engine bay clean!

Good luck.

 

Looks like its leaking directly from the radiator. Im guessing cracked rad core or end tank most likely

 

Time for an upgrade!

New Koyo radiator, aluminum AST, and some new hoses.

 

Don't just GUESS, find the leak and fix it.

You will need to jack up the car and put it on jackstands and drop the belly pan to find the leak. A leak that big won't be hard to find.

Dale

 

Plus 1 on getting a coolant pressure tester. Makes it way easier to find the leak.

This link maybe helpful to locate the leak:
CoolingSystem