Help SC400 overheating and boiling coolant!!!
#1
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Help SC400 overheating and boiling coolant!!!
My 1994 SC400 is overheating and coolant is boiling in the overflow tank. I replaced the thermostat, did a radiator flush and still the same symptoms. It has about 220k miles on it now but was running smooth since I changed the wires and spark plugs. Has anyone went through this problem?
#3
1JZ Single SC400
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Dang it xspsi6, you have beat me to it... check the cap and see if the overflow coolant tank has any leaks or boiling out it around the cap as well. Did you jack the front end up high, heat on high, floor only and flush this way? Maybe still has air in it. How did you bleed it, if you did? Bleed it with the bolt removed beside the front coil pack in the middle of the engine, make sure you have a hot upper hose and the heat is hot. Mine used to really hot in the cabin.
#5
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Encounter this problem recently. Coolant tank was steaming and bubbling, I suspect its either blown HC or still had air pocket since i just replace the radiator. Long story short, it turned out to be blown HG.
I decided to use Bar's head gasket fix, $30.00 at walmart. Luckily, It worked for me. No more bubble or steamy overflow tank.
I decided to use Bar's head gasket fix, $30.00 at walmart. Luckily, It worked for me. No more bubble or steamy overflow tank.
Last edited by GTX580; 09-24-12 at 02:31 AM.
#6
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#7
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Dang it xspsi6, you have beat me to it... check the cap and see if the overflow coolant tank has any leaks or boiling out it around the cap as well. Did you jack the front end up high, heat on high, floor only and flush this way? Maybe still has air in it. How did you bleed it, if you did? Bleed it with the bolt removed beside the front coil pack in the middle of the engine, make sure you have a hot upper hose and the heat is hot. Mine used to really hot in the cabin.
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#8
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Head gasket I'm not sure I haven't seen the obvious mountain of white smoke from tail pipe that usually tells you you have a cracked head. But I know a boiling overflow tank is possibly a symptom of a cracked head. Wouldn't I see a lot of white smoke out tail pipe in this case?
#9
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Encounter this problem recently. Coolant tank was steaming and bubbling, I suspect its either blown HC or still had air pocket since i just replace the radiator. Long story short, it turned out to be blown HG.
I decided to use Bar's head gasket fix, $30.00 at walmart. Luckily, It worked for me. No more bubble or steamy overflow tank.
I decided to use Bar's head gasket fix, $30.00 at walmart. Luckily, It worked for me. No more bubble or steamy overflow tank.
#10
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Ok update I had a chemical test to check and see if I had a cracked head.. Mechanic said it was negative but he checked radiator and said it was clogged!! And to replace it with labor $509 does this seem reasonable or too much?
#12
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When the motor is cold...remove the screw on cap at the T intersection of the coolant hoses that run to the heater valve.. near the firewall...pour coolant into that opening until full....fill the coolant reservoir...start the motor and get it to operating temperature....slowly add more coolant to the T...turn the heater on....replace the screw cap...check for leaks...shut car off...let it cool...do the procedure again
Last edited by trnrrkt; 02-20-14 at 05:45 AM. Reason: forgot to put the cap on
#13
changing radiator is very simple. All you need is to do is learn how to read. dont take it the wrong way. after changing the radiator. make sure you bleed your system. bubbling usually means a leak or air stuck in the coolant system, sometimes known as air pockets. Burp the system as well and if it continues, check your radiator and water hoses. On my toyota truck i found a hair size whole that was dripping water. good luck
#15
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Well guys after all of this time I just found out i have a small crack in my over flow radiator tank. Don't know if this will cause over heating or bubbling but i don't have either of them problems.
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