I have a small rad leak in my 96 sunfire. I spoke to mechanic at shop he suggested to pick up Prestone Rad Stop Leak. On the bottle it says to pour directly into rad and not in reserve tank. I cant seem to find the cap for my rad in order to follow the directions. Is it fine if I just put it in the reserve tank...Help
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vacuum line schematic should be on the rad support under the hood to locate the leak, buy a small bottle of propane put on the nozzle but don't light . as you pass the propane over the leak the revs will increase . you have found your leak
Sounds like to me your mechanic is on the right track by having the rad cap changed. If the coolant becomes low again in the near future and there is no visible fluid leak on outside of engine or on floor/ground then your problem is internal and possibly a head gasket.
this sounds like a low coolant warning light check the coolant level in the rad and the overflow bottle.these also have a problem with the low coolant level sensor.usually located in the rad below the rad cap in the rad side tank.
i bet the leak is in the heater rad!,,,i know a quick way to stop a small leak, go out and buy some "radiator sealer" or "rad seal",,,"engine block sealer" "engine weld" they all work just as well,,if its not cold dont put in the antifreeze that just a pain and kind of looks for leaks,
and finds them too?
If your coolant is disappearing most likely you have a coolant leak I would suggest going to a auto-zone or auto-zone like auto parts store and picking up a bottle of stop leak. You should then add it to your coolant and it can stop small leaks in your coolant systems. if this dose not correct the problem I would suggest taking it to a certified auto shop and have them take a look at it.
Do you did you take out the rad. or have a shop do it for you. Your problem sounds more like the rad is not the right size for your car. The difference is very slight. The rad for a 4 CYL And the 6 CYL look very much alike. they even interchange with one another. But if your car has the V6 and you are running a 4 cyl. rad you may run hot like this.
Now if that is NOT THE CASE,
IF THAT IS NOT THE CASE >. You still have air in the rad. Open the drain port a small bit remove the rad cap, start up the engine and let it run till it reaches temp -- tighten the drain port and refill the rad, and the overflow to full. try all that and God Bless.
Before anything else, you need to locate the source of the leak and repair it. Then after that's done, re-fill the system and watch for problems. I suggest you do this sooner than later as running with air in the system can damage components by creating "hot'spots" that can crack head etc or cause warpage and head gasket failure.