Won't start? Replaced the radiator to my 2000 mercury cougar after it overheated due to a leak and now it wont start, it almost starts but wont turn completely over?

Did you by chance bleed the air out of the system?

could be worn ignition swtich.check battery and connection

sorry to tell you but you have a blown headgasket or cracked cylinder head. that is why the coolant blows out of the radiator and the engine won't start due to engine compression getting into the cooling system.

Obviously the belt that broke! The overheating problem is most likely the fan not turningwhich cools the radiator. Check the pulley where the shaft connects to the fan and that will be theone that needs replacing. If you had a belt that broke, I would suggest changing all your belts and hoses. This prevenative maintenance is cheaper than a tow.

If your not low, and your not overheating, chances are that the level sensor is either dirty, or faulty. It's located in the coolant resevoir.

Hello, blessed_13 and thank you for asking your question on Fixya!

Here is a simple process that will walk you through a few steps that will pinpoint the overheating problem on your 2000 Mercury Cougar, without even using any tools. It has helped millions of people, and I am certain that it will help you, because I wrote it for people in your exact situation.
How to diagnose your overheating 2000 Mercury Cougar
I would pay close attention to the belt tension part of the instructions.

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Thanks for the vote, and good luck!

You got a coolant leak, from a head gasket or intake manifold,if white smoke comes out the exhaust.
No lock on rad cap. Push down and turn

check coolent(in radiator) levels if ok check themostat

what is anti-theft light doing? It should come on solid for about 2 sec after you turn the key on then turn off. If it is flashing after this then it is not seeing the computer chip in the key and you have a PATS problem.

My 1999 Cougar started running hot and I took it to my mechanic and he found that the water pump belt was broke. Replaced belt and all is well. Hope this help.