vicSC400

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?

xspsi6

iTrader: (31)

What is the condition of the radiator cap?

1JZPWRD

iTrader: (59)

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.

2jznosht

hows your headgasket?

GTX580

iTrader: (3)

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.

vicSC400

I also purchased a new radiator cap that was after market from advanced auto parts wondering if i should get the one from dealership

vicSC400

Did all of the above took off the 17mm screw put a funnel in it to make sure no air was in the system, flushed the system twice with the front end jacked up with heat on. My heat doesn't blow completely on high but it does get hot. That was an issue before all of this started happening but it doesn't get really cold here in SC.

vicSC400

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?

vicSC400

I purchased the blue devil head gasket sealant last night, im about to give it a shot this morning. I've seen great reviews from the product and others who've had bubbling overflow tanks prior to using it which fixed the problem.

vicSC400

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?

GTX580

iTrader: (3)

Took me 30 mins to change the radiator and I got my radiator for 137. Pretty simple to do if ure just replacing yr radiator. Might be good idea to change yr thermostat as well while ure at it.

trnrrkt

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

fourstars

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

fourstars

btw, if your not able to find anything and it continues, do a leak down test.

vicSC400

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.