Slow Coolant Leak - How To Find?

[ahazuarus]

Hello all,

I have been buying approximately 1 bottle of coolant per month. I have replaced the radiator, pump, and hoses already.

Any ideas/suggestions as to how I can detect where it is leaking?

[ForcedFirebird]

Easiest way is to inject air into your system (DO NOT EXCEED PSI RATING OF RADIATOR CAP). You will instantly see the coolant squirting from any breeches. I have a kit I purchsed for the job that has all kinds of radiator/expansion tank caps and a fancy little guage, but all you really need to do is block off the ratiator/expansion cap (don't forget the overflow tube) and fill with air.

[ahazuarus]

I have an air compressor but I don't have the appropriate fittings or pressure gauge.. how much did you pay for your kit?

[ForcedFirebird]

I think it was about $100.

[pocket-rocket]

You can get a "Loan-A-Tool" coolant system pressure tester at Autozone. Just have ~$90 with you when you go in. You get every penny back when you return it too. Also listen for air hissing if you can see the leak- including through the oil fill hole in the front valve cover.

[Skeith]

you can buy a dye that will flourece under a black light to add to your rad. if its a tiny leak it may be evaporating too quickly for you to find the problem. run that for a bit and then use a black light to examine the engine compartment, when you see the glow thats where the leak is.

[86FieroSEv6]

^^^THIS^^^ . . . . just be cautious because certain metal alloys and plastics will "glow" as well. If you put a drop of the dye on a shop rag and shine the light on it you will know what you are looking for. Also, there should be some special glasses to use, they are yellow like shooting glasses. The glasses will enhance the dye effect and help to reduce false detection.

[pocket-rocket]

Also, there should be some special glasses to use, they are yellow like shooting glasses. The glasses will enhance the dye effect and help to reduce false detection.

And probably protect your eyes from the UV rays. Right Dave?