coolant expansion tank developed a pinhole leak on the side. is this another common problem?? anyway i got a new tank on order and i'm looking for ideas to patch up the leak. think duct tape can hold against 200 degrees F at max at 20 psi??

 

Use a soldering iron to push some plastic around and weld the hole up. Alt. B drill slightly larger hole, fill with high temp silicone, mushroom silicone in the tank, do not tighten cap all the way so it does not build pressure.

 

 

The soldering iron idea is very clever, but an alternative is to drill out the hole enough to plug it with a small, pan head all-purpose or sheet metal screw.

That's what I did a few years ago when the smaller nipple to which the line to the throttle body heater connects cracked. It was perfectly fine for a few months until I got around to ordering a replacement reservoir off eBay for ~$35. I should have saved the $35 and kept the old one plugged by a screw. I'm confident it would be going strong today, and who needs the TBH circuit? (Wait, that's another thread. Or a few dozen threads.)

 

Just get a new tank!

 

Agreed, TBH is pointless in texas. Turns out duct tape worked just fine. Not driving the car until my new tank comes in. Any tips on installing to new tank for first time? Making a run to autozone for 13 L of coolant

 

I like your screw idea better! Seal it with silicone and you are good to go!

 

Have you ordered a tank yet? I've got two in my garage that aren't being used. Price of shipping and it's yours. I deleted mine so I've got no use.

 

Ya amazon has landrover parts with prime i should get it here in 1 day. I wish i knew u had extras laying around though they arent very expensive. Thanks for the offer

 

I used this stuff to patch up a pinhole in my radiator. I've been running it for a few months now and no leaks at all. Definitely recommend as long as you don't care about looks, cures in an hour too.