radiator issues

[jt1500]

okay so i was commuting back from school the other day and my truck started over heating so i pulled over and all my coolant had poured all over the pavement, so i look at my rad and the drain tap is gone. so i put in another free used rad with working plug and iim good to go for a couple days, no leaks no nothing. today i drove my truck for 15 mins and its leaking out of the drain tap i believe. i pulled the plug and the 0-ring seems in decent shape. is this a common issue? can i just replace the plug? or what is your opinion? its a 96 5.7 vortec btw

 

[Chewy1576]

The radiator cap isn't relieving pressure like it should and it's blowing out the drain tap?

 

[jt1500]

The radiator cap isn't relieving pressure like it should and it's blowing out the drain tap?

that may be possible, but ive driven it about 400km's since changing it and its worked well up until yesterday. maybe ill try my other rad cap.

 

[98_k1500]

Probably would get a new o-ring for it. They can be damaged and look just fine. Grease it before you install it to get a good seal. Any parts house should have a o-ring assortment and be able to sell you an individual one for $0.30

 

[jt1500]

i just broke down and bought a new radiator for it. apparently its the "heavy duty" application? seems pretty beast in size compared to my original. this better solve my issue.