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Post a pic.
 

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Looks like getting a socket to sit squarely on the bolt head is your problem. It may take removing hoses first. Use a 6 point socket, not a 12 point socket and loosen it by hand, not with an impact wrench.
 

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Buy a bolt extractor kit. Here's a link to show you what they look like.
You can search Youtube for videos of how they work.
 

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2013 1.4L SXT Rallye Citrus Peal
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You may not be square on with the bolt head because of the hose. That would possibly make the difference in getting a good grip on it.

You might try a short socket with a wobble extension.
CRAFTSMAN 3/8-in Drive Wobble Socket Extension in the Socket Extensions department at Lowes.com

If socket still slips, you might be able to get a socket like this to work, but again, you need to be squared up on the head.
Gator Grip 3/8 in. Universal Socket with Power Drill Adapter-ETC120A - The Home Depot
 

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Discussion Starter · #8 ·

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If you have a really bad case of rust in the system, then you might try Thermocure. It requires a lot of flushing (like 3 times) after using it, but it does a good job.
 

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It's possible a previous owner mixed in the wrong coolant. You should be using the 10 year 100,000 mile OAT coolant.
 

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Have any body had a rounded thermostat bolt trying to find a way to remove the bolt. This bolt is a pain in the a••.
After having 13 Darts, learned the best way is to disconnect all coolant hoses, unbolt heater hose bracket, remove air box top, get rid of all the items in the way. Hose clamps are cheap, compared to the time fighting bolts.
Then take a bar or big flat tip, bend the radiator hose bracket mounted under thermostat. Just an 1/8th inch makes a big difference. Using a wobble head 1/4 drive (harbor freight green handle) a 1/4" wobble end extension and or a 1/4" impact universal. With a 10mm short socket. In past had to fish, fit socket on, the extension and ratchet. Been using an Oriellys thermostat with sensor and housing.
When installing, alternate the tightening of the bolts when they are almost tight. Helps center and compress o-ring.
If antifreeze is trashy dirty, use water hose to back flush heater core both directions, use of lower psi compressed air can help flush core. Remove Lower radiator hose and with thermostat housing off, flush engine too. If not dirty, just r and r and go.
 

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Discussion Starter · #16 ·
what can u use to flush the system with



After having 13 Darts, learned the best way is to disconnect all coolant hoses, unbolt heater hose bracket, remove air box top, get rid of all the items in the way. Hose clamps are cheap, compared to the time fighting bolts.
Then take a bar or big flat tip, bend the radiator hose bracket mounted under thermostat. Just an 1/8th inch makes a big difference. Using a wobble head 1/4 drive (harbor freight green handle) a 1/4" wobble end extension and or a 1/4" impact universal. With a 10mm short socket. In past had to fish, fit socket on, the extension and ratchet. Been using an Oriellys thermostat with sensor and housing.
When installing, alternate the tightening of the bolts when they are almost tight. Helps center and compress o-ring.
If antifreeze is trashy dirty, use water hose to back flush heater core both directions, use of lower psi compressed air can help flush core. Remove Lower radiator hose and with thermostat housing off, flush engine too. If not dirty, just r and r and go.
 

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A yard sprayer, with on off valve. And a air blowing nozzle, use low psi, as to not warp heater core. If system is trashy, before you start this procedure, drain coolant, fill with water and add pristine radiator flush, or preferred brand. Follow direction but short 20 min road trip works too. Do not leave in, can eat on head gasket sealing surface. Drain again, refill and run, then drain and flush engine and core with hose water and or air, alternating heater hoses, . Refill with 100 strength coolant and distilled water, regular water can be used but lime build up could occur. Recheck coolant strength. I use 100 % because of trapped water in block and core. 50 50 mix with residual water may make it unsafe for winter temps.
 

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Refill with 100 strength coolant and distilled water
That's correct, but just to expand a little on that...

You will not know how much water is left in the system after you have done the flushing and final drain. So first you put in full-strength antifreeze equal to 1/2 of total system capacity. Then you top it off with the distilled water. When done that way, you should be at 50/50 mix.
 

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You want to do your flush with distilled water. Use a tool like the UView Airlift or similar to prevent trapping air. Make sure to use OAT coolant.
 
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