First time posting here. Any help would be GREATLY appreciated! My 626 is causing me a ton of problems. 2 of my O2 sensors are blown and I need to replace them, but need a little more $ first. In the meantime, my engine started to overheart a bit the last two days. A few weeks ago the tech. said I may have a small radiator leak. I got some Bar's Leaks radiator stop leak and radiator fluid, but don't know where to put it!! Sorry, I'm a chic and I'm really trying to learn some of this basic car stuff. Anyone have a diagram to show me which cap to take off? Any other experience with overheating issues? Also, do I have two separate problems (O2 sensors and the radiator) or could the blown O2 sensors cause my fuel line mix to be off and lead to engine overheating?

Thanks in advance for the help!

 

What year is your 626 and do you have the 4 cylinder engine or V6. The 4 cylinder only has on radiator cap for filling cooant on the passenger side right at the radiator. the V6 has 2, one on the engine near where the upper radiator hose attaaches and another at the radiator area on older 626 and right front corner of engine compartment on later model 626. See diagrams below.
Bars stop leak is a bit scary to use as it can stop leaks but can also plug up both the radiator and heater core causing even more problems. Best to just fix the leak if at all possible. Try putting a large piece of cardboard under the engine area, starting up and allowing to run while looking for any drips and area they are coming from. Sure would hate to put the stop leak in for a loose hose clamp or something.

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4 cylinder engine

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Later model V6