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Discussion Starter · #1 ·
At the drive-thru and cars starts overheating. Temps max out, warnings appear and coolant begins leaking. Coolant only appears to be leaking from the overflow tank area. I checked the dipstick and the oil looks normal.

I'm not a mechanic or even close, just a car lover. I hope it's just the thermostat stuck in the closed position, but would love some feedback.
 

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make sure the fans are running ? if its only when stationary but good when ur driving sounds like an airflow issue with the fans, or if it gets hot all the time then id look at the thermostat
 

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Discussion Starter · #3 ·
make sure the fans are running ? if its only when stationary but good when ur driving sounds like an airflow issue with the fans, or if it gets hot all the time then id look at the thermostat
The fans are working. When it initially happened I was beside an Advanced Auto. I let the car cool down and filled up the coolant. Did this a few times so I could get home. It was a short drive but took about an hour and a half. I will go tomorrow and grab a thermostat and figure out how to replace it and test it out.
 

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if u have the belt off try and move the water pump pulley if its got some decent play in it then it may be leaking and usually when hot so it evaporates sometimes before it can drip, usually u can see a water stain mark under the water pump if its leaking
 

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Discussion Starter · #7 ·
if u have the belt off try and move the water pump pulley if its got some decent play in it then it may be leaking and usually when hot so it evaporates sometimes before it can drip, usually u can see a water stain mark under the water pump if its leaking
Well, I took out the thermostat and tested it. It works and opens up. The water pump pulley has no play to it. Also, what worries me the most, is the coolant is pink and slimy. I don't know if this is because I might have mixed incompatible coolants together that same night or if it has been like that and has caused the issue. The car had no smoke or knocks. Just overheating and coolant dump.
 

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Thick and slimy coolant could be overly concentrated as in maybe you didnt add the 50/50? Could always try doing a coolant flush. A member just posted recently about an easy way to flush our systems without taking the lower hose off.
 

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Discussion Starter · #9 ·
Thick and slimy coolant could be overly concentrated as in maybe you didnt add the 50/50? Could always try doing a coolant flush. A member just posted recently about an easy way to flush our systems without taking the lower hose off.
I did add 50/50 but in the heat of the moment, I don't think it was compatible. Still not sure why the car overheated like it did. Maybe a bubble in the system or maybe it was low on coolant in the first place. Being low would be odd, because I recently had the oil changed and they checked all fluids. I am stumped right now.
 

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Flush the entire cooling system with water, ideally it’s easier with the thermostat removed, then button it up, go for a drive and see if it overheats again. If it does not overheat, drain it again, add 30 to 50% new coolant, and you should be good to go. Make sure you burp the system.


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Discussion Starter · #11 ·
Flush the entire cooling system with water, ideally it’s easier with the thermostat removed, then button it up, go for a drive and see if it overheats again. If it does not overheat, drain it again, add 30 to 50% new coolant, and you should be good to go. Make sure you burp the system.


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The thermostat is still out. I will see if I can flush it tomorrow. I will update here with any results. Thanks for the help!
 

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best thing i done was get one of those coolant bottles that screws onto the radiator so u can fill it past the top so its the highest point to help get the air out, also must have heater on full hot even if fan isnt on so it circulates properly around the bypass helps too
 

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Discussion Starter · #13 ·
best thing i done was get one of those coolant bottles that screws onto the radiator so u can fill it past the top so its the highest point to help get the air out, also must have heater on full hot even if fan isnt on so it circulates properly around the bypass helps too

Since I'm totally new to this, what is the process to flush it?
 

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Since I'm totally new to this, what is the process to flush it?
check radiator to see if u have a drain plug or u may have to take off bottom hose, its hard to get it all out so u can fill and then empty until the water comes out clear then estimate the amount in block when pre mixing the coolant to ad in, if u have the steam vent hose at top of head u can take that off to make sure air gets pushed out when filling until it spills out then connect back up, i find the LS a pain to get all air out so fill best u can then get up to operating temp with heater on and make sure it keeps coolant temp when fans turn on, if it keeps heating up then prob have a air pocket, make sure the over fill has enough in it for when it cools back down over night
 

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Discussion Starter · #16 ·
So the transmission fluid is mixing with the coolant, getting a new radiator and trans and coolant flush. According to the shop everything else looks good with the engine itself.
 
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