03 MARAUDER OVERHEATING

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dbrown

New member
Hey guys, cant seem to solve the issue with my 03 Marauder w/ 110k miles overheating. I changed the water pump, thermostat, and a coolant temp sensor (driver side). I also followed the recommend Burp Procedure. The fan blows, the hot and cold air work on the AC. Ive run out of ideas here guys. Any help would be greatly appreciated.
 
Make sure you got the right thermostat. A number of thermostats listed for the Marauder on a number of sites, say they also are for Marauder but are actually the wrong ones. They are for Grand Marquis, etc. which is not the same.
 
This is the thermostat I bought

Is this the right one?

Murray plus part number 4139
 

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The fan comes on. I will spray the radiator off when I get home from work. I just need to know if I put in the correct stat. I listed it above ^
 
Is the crossover tube full while the car is off and cold? Common problem is people don't fill the system enough and the COT is low which makes it overheat fast.
 
Yes it is...I've searched the threads for every overheating issue and tried everything I could find to solve the issue. I'm now thinking it may be something with the radiator but that doesn't seem to be a common issue with Marauders.
 
Bad cap on the degaussing tank. I’ll almost guarantee that it tests bad, and if it does, the car will overheat.


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I spent $60 on ramps and burped it again with the front end elevated. Everything seemed ok, until I took it around the block and got on the gas...temp gauge rose almost to the red....IM THIS CLOSE TO BUYING A CHEVY!! Help me damnit.
FYI I did notice that the temp held when i was stopped but slowly rose when i was on the gas.20201014_202821 (1).jpg
 
When it's over heating is coolant flowing in and out of the rad? Put on some gloves and squeeze the hoses.
 
yes I believe so....however the lower hose does not seem to be pressurized and is never as hot as the other hoses...I believe thats normal though..I could be wrong. Is there a possibility that the fan could be bad? It spins when the temp rises..but I read somewhere that that doesnt mean its doing its job.
 
It can take more than one burping procedure.. Are you following the steps in the stickied post here in the forum? Replace the cap in overflow tank..(degaussing) if it overheats when accelerating, seems like air pocket preventing flow to me. Is stat installed in correct position?
 
It looks like your Murray thermostat is identified as a Marauder tstat but a number of posts and acknowledgements identify this tstat as being correct

Motorcraft RT1085

You may want to try another tstat (the Murray is bad?).

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Thanks, I looked for the RT1085 but cant find it. I ended up taking to the dealership this morning, because she is my DD and i cant go long without her. I'll post the results of the Diag
 
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