Over filling the reservoir tank?

Tiny
JRANDLIZ
  • MEMBER
  • 2021 DODGE CHALLENGER
  • 3.6L
  • V6
  • 4WD
  • AUTOMATIC
  • 56,060 MILES
I changed my thermostat. There was air stuck at the thermostat. I bought a upgraded version. The bleeder bolt was not cut for bleeding. The auto repair shop said take the cap off and let it run. I did that. It bubbled over, I turned off the engine. While I was waiting for the bubbles to stop the tank cycled into the engine. It left my tank low. I refilled the tank. Then drove it for a few miles on a highway. Did I put in to much coolant?
Thursday, August 21st, 2025 AT 4:38 PM

5 Replies

Tiny
MECHTRIX
  • MECHANIC
  • 382 POSTS
To much is better than not enough". That said here is how to check it.
Let the engine cool down completely
Take the cap off the radiator when you know it safe to do so
Look to see if the coolant level is up to the filler neck if not add a bit till it is
Then "
Put the cap back on and check the coolant catch tank there should be a mark on it somewhere that reads high and low if its on the lower level. Just add some till its on the high level. Note " that level is usually about half to three quarters to the top of the reservoir [it varies) but you'll see it one the side. That little bit of extra space gives coolant room to expand when it gets hot. But yeah if its at the full level line your good to go. Good luck hope this helps.
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Thursday, August 21st, 2025 AT 6:30 PM
Tiny
MECHTRIX
  • MECHANIC
  • 382 POSTS
Oh and after filing it and driving it around some times I check it the next morning when it had all night to cool and settle down.
If its still full in the morning its not leaking anywhere.A healthy cooling system with always hold its level over night. Be well ".
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Thursday, August 21st, 2025 AT 6:39 PM
Tiny
JRANDLIZ
  • MEMBER
  • 2 POSTS
Yeah I thought I over filled it. I didn't, I didn't realize the coolant is pressurized system. But now I have to do more work on it. I have to have it flushed and filled again. I bought a coolant at Walmart that stated it's for Dodge, Plymouth, Chrysler, Ram, and Jeep. It's a purple color. So I have to flush the system. Trying to see if Valvoline will do this service.
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Thursday, August 21st, 2025 AT 6:48 PM
Tiny
MECHTRIX
  • MECHANIC
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Sounds like you have the right stuff if it says its for Dodge.
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Thursday, August 21st, 2025 AT 6:54 PM
Tiny
MECHTRIX
  • MECHANIC
  • 382 POSTS
Yes I'm sure any oil change place can change it and recycle it safely for you.
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Thursday, August 21st, 2025 AT 6:56 PM

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