DoubleChevron
Real cars have hydraulics
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Fellow Frogger
Be carful not heat too much as all of top solder might melt and destroy it. Mine had same problem and I tried to blow torch silver solder but I Now I learned, normal solder should have been used. So mine was destroyed . I took mine to PRO and bill was over $400.00. Now I am scare of leaking radiator.Man put new copper core , he said copper is expensive now. No wonder people steal copper wires from power station.
Silver solder is WWWAAAAaaaaayyyyy to hot. Isn't it's melting point about 450degrees versus about 200 for normal plumbers solder

$400 for a new radiator core with repaired tanks fitted sounds reasonable to me. The cost was your new core, not the tank repair by the sounds of it. If he needed to replace the core, you probably did yourself a favour .... A new radiator is better than an overheated engine

With regards to a level sensor ....
The level warnings on ebay seem incredibly expensive. I was thinking something like this:
Mini Vertical Stainless Steel Liquid Water Level Sensor Horizontal Float Switch | eBay
screwed into the top radiator tank, wired into a simple hidden buzzer inside the car would be perfect. You can buy buzzer/piezos cheaply.
12V DC Relay Buzzer | eBay
It would be less than $20 all setup and should be reliable being a simple float valve and buzzer with no electronics.
seeya,
Shane L.