Radiator Top Tank Discoloured

[optin]

My radiator top tank on my sx6 had discoloured from black to a yellowish colour and my mechanic recommended I replace it immediately as he said because it's plastic it was about to blow, is this correct?

I've searched online and can find no mention of plastic radiator tanks letting go after they become discoloured.

I had him replace it as I trust him & it wasn't an expensive exercise for the peace of mind.

However, I'm now living overseas for a few years and my camry v6 here has the same issue of the top tank of the radiator turning yellow in colour, and here it's proving very difficult to source a new radiator, so if it's not true I'll stop looking for a new radiator as the car's running fine

Edited November 19, 2015 by optin

[trentmeyer23]

The plastic will perish over time.

[nz pom]

Iv never had this happen but the logic seems to make sence i recon if ya doin town driving just keep a eye on it if ya doin long distance id replace it for peice of mind cause garentied if its guna blow your guna b in the midle of nowere