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A no heat concern can be caused by several things. First check the coolant level. You will see a cold fill level and a hot fill level on the expansion tank. Be sure that the level is correct. Next, with the vehicle at operating temperature, feel the coolant hoses going into the heater core at the firewall. One should be hot and they other should be close to the same temp. Use caution, the exhaust manifold is close to these lines. If you have heat at the heater hoses then chances are your thermostat is working correctly. If no heat at the heater hoses, you could have a thermostat that's stuck in the open position.
If there is heat on only one side of the heater core, the core is plugged which is common on this year Sable/Taurus. I've had luck removing the heater hoses (careful not to damage the core tubes) and backwashing with a garden hose. Be sure to recycle any anti-freeze. You will see obvious debris/sludge. Reassemble and check for heat, being sure to purge all air from cooling system.
If there is heat on both sides of the core, the concern is inside and more detailed diagnosis is needed. Good luck.
Check your coolant level. It may be low.
Did they put the proper mixture of anti-freeze back in? I would have the anti-freeze checked. Or you can buy a simple little tool for a few bucks and do it yourself.
A radiator hose is supposed to be "hard" to withstand the heat. If hoses become soft it is time to replace them.
I don't know enough about Mercedes to answer your question much further other than to suggest the thermostat. If they put in a new radiator, they should have suggested putting in a new thermostat also, but they don't always do that.
It could be one of two things. 1. Bad thermostat. Your thermostat is pobably not opening when the engine warms up. Install a new thermostat and you should be OUT OF THE COLD. If not, 2. Your heating core and radiator is probably clogged. One way to solve this is. Flush out your radiator with radiator flush kit. Pease read your owners manual, (YOU NEED TO USE A SPECIAL TYPE OF ANTI FREEZE). If you use the the green color Presotne anti freeze, It will gradually corrode through the linings of your radiator. And the green color prestone anti freeze will blow out the radiator. So read your owners malual ( I beleive it says you have to use Dextron Anti Freeze ( Pink Color).. Replace your thermostat and flush out your radiator. Then refill your radiator with dextron anti freeze. Also make sure the anti freeze resivor is filled to the proper level.. Once you do all of this, YOU DEFFINITLY WILL BE IN HEAT.. YOU CAN DO THIS YOUR SELF ( iT WOULD TAKE ME NO MORE THAN 1 TO 2 HOURSFOR ME TO DO THIS IN MY DRIVEWAY) OR YOU CAN HAVE THIS DONE AT ANY QUICK LUBE LOCATIONS... HAPPY MOTORING
Check you coolant level! If the level is good you may have a stuck thermostat which is available at you local parts store. Some of these are easy to replace and some are a bear. You also may want to check you coolant to see if you have the proper mixture of anti-freeze. If you have too little anti-freeze in your system it may be freezing up.
Sounds like the typical symptom for a failed thermostat which is stuck open.
After the car has operated for a while, check the rubber radiator hoses; if they are not hot and hotter, the thermostat needs replacement.
Check the radiator, top it off with anti freeze. If it's low then you will most likely have a bad radiator cap or hose going to the overflow tank. If the Antifreeze is ok then the next thing to check is for a vachumm leak, you have no vachum at idle and you should have vachum at highest level. So check the fluid level first.