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  1. My car is w211 e550.
    Screenshot_20200216-133646_Samsung Internet.jpg
    I broke the plastic at radiator that connect the hose for water to running back through coolant reservoir. Is that have to be replaced whole radiator or any solution to fixed. Another question is the car can drive?
Thank you
 

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1989 W124 260E
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Clean it up find a pipe to go inside both and bond it on . Picture not to informative of the place it came off the radiator .Its only a flow back hose as long as coolant is able to return it should work ok .Its this repair , or replce the radiator .
 

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1999 S500; W140.051
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Been there, done that. It will leak. It won't leak a lot, but it will leak. I have never found a reliable bonding agent for that glass-filled nylon that can make a leak-free joint especially with the nylon being 'impregnated' with the glycol over years of heated/pressurized soaking.

You also have to find tubing and size to the hole. Brass tubing for model building is the best candidate. You'll have to 'pin gauge' measure hole, then find best fit tubing OD, then probably open hole to fit brass tubing by drilling with pin-vise & drill, then epoxy & cure pretty much fully before filling again with coolant.

The fact that this aged plastic breaks as easily as it does shows that it's impact strength is getting low (it's getting brittle). Those overflow fittings on radiator and expansion tank are the most fragile features. On any 10+ year old part, placing any 'side-loading' by pushing on it 'off-axis' with the hand is likely to make a crack, then it starts to leak and the crack just migrates (enlarges).

If you're going to keep the car for another 5 years, radiator is probably an eventuality. For the hassle of draining & refilling coolant, you might consider doing the new radiator and new coolant just for the peace of mind of having a reliable cooling system.

A cooling system failure can be very inconvenient and expensive.
 

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1999 S500; W140.051
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Driving the car with a open hole at the radiator overflow fitting is not advisable at all. System cannot pressurize and will push coolant out of that hole. Coolant level too low could allow air cavity in cyl heads and this could cracking of cyl heads.

You don't even want to think about how expensive that problem would be.

Since coolant level sensor is in expansion tank that would be empty, status message in instrument cluster is going to say 'Low Coolant' all the time so you will have no indication except temperature and that isn't reliable if there is air in the coolant circuit.

Even if you plugged the hole, without the expansion tank in the ckt, you're going to have a problem filling the system, let alone trying to bleed the air out of it.

Don't drive the car without getting cooling system properly filled and bled.
 
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