Car runs hot but isn't overheating.?

Question

Hello, I have a 2014 dodge charger with a 5.7 hemi. I had just replaced the head gaskets, camshaft and lifters on the engine. it ran great on the test drive, and the temperature stayed perfect the whole time. The next day i drove it for about 30 miles then i heard my belt sequel, and i checked under the hood to see that my upper radiator hose had fallen off. I'm guessing it squealed because coolant had soaked it. I re clamped the hose and went home and noticed the heat had stopped working. After getting home, i refilled the cooling system and bled the cooling system and took it out on another drive, after warming up, the heat stopped working and the car began to run hot but did not overheat. so far i have checked all my hoses, and they all are on tight and are in good condition, i also checked the thermostat and there wasn't any issues with that. I have also bled the system multiple times, but it still runs hot and the heat only works for like 5 minutes. Lastly, I've noticed that the coolant overflow tank gets filled with coolant when the car is on, and the level will only drop if i remove the bleeder screw from the engine. There are no signs of a head gasket failure, oil is not milky, but i will be doing a compression test tomorrow to verify that. any ideas would be greatly appreciated. I am not a mechanic, but i have enough experience working on my own cars. To conclude, everything was perfect until that radiator hose blew off. 

Answer 1

On the off chance that you find that you have a vehicle running hot yet not overheating there may be a couple of reasons: Clogged or harmed radiator. Low coolant level. Harmed water siphon or indoor regulator.

Answer 2

crack in cylinder head

do you job again with new cylinder head

Answer 3

Does the belt drive the water pump or are they electric fans? Try the Finnigen pins. If they haven't been tightened properly with a left-handed torque wrench, they can cause vapor lock.

Answer 4

Cool, do you have a question?

Answer 5

check the O2 sensors in the exhaust system .................

Answer 6

Are you looking at an actual gauge (with numbers) when you say its running hot, or do you mean it on the "hot side" of the temperature range on a gauge? I'm agreeing with The Bax2006...I think you have air trapped. Surely when they had the top end of your engine off, they replaced your water pump and thermostat assembly, right? Your hose "fell off" ? It wasn't clamped? The clamp was on the hose, just not in the proper location? It was a factory "spring" clamp right, not an adjustable hose clamp? How are you checking the thermostat? You know for sure its opening completely? I just had to replace one that was sticking...just say'in...What happened to roach the top end to begin with?

Answer 7

Running hot IS overheating.

Answer 8

Pouring cold water in an overheated engine without it running will crack the cylinder head. Slowly filling the radiator with the engine running is a safer way to do it, but no heat from the heater means that it is not filling with coolant- the cooling system is not filled. Yeah, start diagnosing for blown head gasket/cracked head. The death execution probably was carried out driving the hot engine after the hose blew off, losing coolant. Air in the system allowed boiling and steam pockets and damage.

Answer 9

So you blew all the coolant out of the motor and then drove home?!  Find a vacuum fill tool such as an "Airlift" brand vacuum fill tool for the coolant and use it to make sure all the air pockets are out of the cooling system. Better hope that's it or else you overheated the motor driving without coolant and ruined your new head gaskets.

Answer 10

Sounds like air pockets trapped in the coolant system. That usually works out as you run it, and then fill the coolant.

Answer 11

Replace the belt. Sometimes, a blown head gasket leaks into a cylinder & the oil stays clean. Are you losing coolant? . There's no flow into the heater. You need to pull the heads - again. Flush the motor.

Answer 12

Engine NORMALLY RUNS HOT?  As for the squealing, tighten the alternator by loosening the bolt in the slot adjustment and use something like a wooden hammer handle for leverage to slide the alternator farther along the slot so the belt is like the E string on a Guitar(a high pitch) or really tight and then tighten the bolt on the alternator so it does not slide looser.  It is suppose to be that tight.  You ain't got the strength to break the belt with 1 foot of leverage.

. The thermostat does not have anything to do with this as being faulty; however you got an air pocket in it.  You do not know how to refill it properly so you will always have the air pocket BEHIND THE THERMOSTAT. most likely.

. Modern cars are not refilled like the old time machines because the thermostat is located in a different place than the old engines.

. My old Chev engine had the thermostat at the top of the engine under the TOP rad hose.  So you could refill just the radiator and it would fill up every nook and cranny.

Schitty gas mileage. Low power output.

On newer engines the thermostat is located on the BOTTOM RAD HOSE so rad refilling is done differently.  Probably take off the top rad hose and pour directly into the rad hose to fill the engine until fluid comes out of the upper rad hose.  The thermostat is closed so you filled the engine side.  Now, slip that hose back on and fill the radiator...the other side of the thermostat.   Now you filled BOTH SIDES of the thermostat.

 You can dump and reuse the contents that is now in the overflow tanks...when refilling the radiator(so nothing goes to waste.   You may need to put some in the overflow tank to the cold line (which is the lower line)   Tighten everything up and take it for a burn.  Yes the overflow will fill up more when the engine is hot - that is normal.  When the engine is cold (like overnight) the level should be at the low line in the tank.

. Leave the "bleeder screw" ? alone. It all should be right now.

. I don't have a picture of the engine cooling system but I am supposing the thermostat is at the bottom rad hose. 

Answer 13

Why do people think it's ok to keep driving a car with an overheated engine? 



I'll bet your aluminum cylinder head is warped.

Answer 14

How much coolant did you have to put back in?



You may have borked it.

Answer 15

Check for a bad water pump and a clogged radiator.

Answer 16

When the engine is cold squeeze the top hose repeatedly as this can move trapped air. As you have checked the stat it is most likely to be a slug of air slowing the coolant flow.