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| Overheating issue after run (Page 1/1) |
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Chris Zimmerman
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AUG 06, 01:34 AM
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I have a 1986 se with the v6, went out testing it today after getting plats. it ran around 200 went running down the highway. after stopping and letting her cool down the overflow started to boil out and drains all the coolant out of the system. So i was wondering if this is due to the radiator, clog line, blown head gasket, lines being on backwards, or the overflow having a crack.
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Patrick
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AUG 06, 02:37 AM
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| quote | Originally posted by Chris Zimmerman:
it ran around 200 went running down the highway. after stopping and letting her cool down...
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No wonder it got hot if you were doing 200 down the highway! 
I assume you meant 200°F? If so, why was there a need to let it "cool down"? When you stopped to do so, did you turn the engine off? If so, that may've been the reason why coolant began puking out the reservoir. If you didn't turn the engine off when you stopped, was the rad fan on?
Prior to blasting down the highway with this new (to you) car, did you at least check the coolant level in the reservoir first?
You'll need to properly fill the coolant system now. I've posted the method I use Here.[This message has been edited by Patrick (edited 08-06-2022).]
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fierofool
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AUG 06, 10:48 AM
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Chris Zimmerman
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AUG 11, 12:33 AM
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| quote | Originally posted by Patrick:
No wonder it got hot if you were doing 200 down the highway!
I assume you meant 200°F? If so, why was there a need to let it "cool down"? When you stopped to do so, did you turn the engine off? If so, that may've been the reason why coolant began puking out the reservoir. If you didn't turn the engine off when you stopped, was the rad fan on?
Prior to blasting down the highway with this new (to you) car, did you at least check the coolant level in the reservoir first?
You'll need to properly fill the coolant system now. I've posted the method I use Here.
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sorry that it took so long to reply. I the overflow was full but wasn't properly burp till I read what you sent (and it was Fahrenheit was just ranting due to the issue) and it did fine after being burp. but the next day when I ran it for about 15 mins max I stop and it boiled over again (the day of testing when burp contend of a 30 min constant run and a few on and offs) so I just sat wondering why.. then today I drove it to work (due to not having any other way and about a 20 mile drive in about 100 °F) and it boiled out after stopping in temp it got around to 212 °F without the thermostat. after work I burped it again and checked to make sure everything was fine so open the thermostat cap and saw coolant and thought that was weird, then open the radiator and well there was still pressure then I put the cap back on once I found the pressure in the radiator then all the coolant that was at the thermostat neck was gone. so i filled it back up and burp it. then drove the same distance and its about 73 °F and it sat around the 203 °F then stopped and nothing overflowed/boiled out and it still sat at 200 down the highway... but never overheated
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sanderson231
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AUG 11, 02:43 PM
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Not sure on your procedure for filling the system. When doing initial fill, leave the radiator cap off until radiator overflows. If you don't residual air in the radiator will substantially decrease radiator cooling capacity and amount of coolant in the system. "Burping" procedure vary. I just fill to full in the back, start the engine for 30 seconds, refill in back, repeat until back remains full after cycling the engine.
If the system is properly filled but the problem comes back, it may be a head gasket or cracked block allowing exhaust gases to re-accumulate in the radiator.
Your temp gauge must be way off if it boiled over at 200 'F or the coolant must be all water.------------------
formerly known as sanderson
1984 Quad 4
1886 SE 2.8L
1988 4.9L Cadillac
1988 3800 Supercharged
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andreww
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AUG 11, 08:59 PM
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First, you haven’t answered if your fan is ever running? If you have AC, turn it in and the fan should turn on. If you don’t have AC, locate the fan sensor switch in the engine bay, pull the connector, turn the car ignition on, but don’t start the car, then stick a piece of wire in the connector and touch the other end to the engine block. The fan should come on.
Second, check the coolant tubes that run under each door sill. These sometimes get crushed by people jacking up the car improperly. This limits flow and the car will overheat.
Third. Is your thermostat functioning? Remove it and put it in a pot of water. Start boiling and observe ifit opens.
Fourth, are you running the heater while burping? If not you can trap air in that portion of the system, and you’ll overheat.
Lastly, water pump could be toasted. Some are made with plastic impellers that can fall apart.
Just be patient with the burp. Leave the radiator open and let it spew a good bit of coolant out. Make sure you jack the back end as high as possible. Replace the rad cap an let it idle, watching through the thermostat. If it goes down even a little, add more. Close the cap and go for a run. Let it cool. Check both caps again. It’s a messy job, but it needs to be done right.
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