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My Buick 95 Gran Sport's steaming/had shut down on the freeway

I was on the freeway, heat gauge was climbing and then it shut off, thankfully. Tons of steam and smoke poured from under the hood. Found steams seeming to pour out of the folds/foils of the radiator on the driver's side. Tons of leaking coolant. Recently poured two types of sealant in with 50/50. Gauge keeps reading hot with lots of steam, very little leakage from the same area. Now the leakage appears on the passenger side. the radiator cap was cool to the touch, reservoir still has fluid, top radiator hose was HOT with very little pressure at all, residual fluids around same areas. What's the remedy? Thanks.

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Sounds like you had air lock possibly need a new thermostat. Sealants work on pinhole leaks, but not much larger. I may be bearer of bad news. Sounds like your radiator had given it's life to save your motor.
You don't state miles, but you may be due for timing belt at which point most often a change of water pump is cheap insurance and preventive maintenance rather than paying same labor twice.

When car was hot did you by chance run the heater? That can help bring temp down on coolant. It will tell you if system is plugged too.
If it blows cool than normal and radiator has big leaks you'll need to replace or re-core your radiator after which you should get a good radiator flush done to remove excess sealant that is not required if you replace the radiator, water pump & thermostat so it doesn't plug heater core and smaller cooling holes in the engine. Too much sealant can plug your thermostat too making issue even worse.
Hopefully you haven't warped the head due to excessive heat.

On my '99 528it Wagon the temp gauge will spike on occasion if I don't drive it regularly. For temp fix I put car in neutral, shut my car off, then restart. So far the thermostat has released. Hoping to make it until next spring when it warms up. As my second BMW one of the easiest brands to work on I've owned. Bentley Shop manuals I buy provide all a back yard mechanic can use. Though not cheap (Haynes is also supplier of shop manuals) even if you don't work on your own vehicle it provides information so you can verify what your mechanic is doing.
PEACE

Posted on Nov 27, 2013

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Sorry about this, but it appears that 2 types of sealant have blocked your thermostat. You have lost circulation in your cooling system, you will need to reverse flush your full cooling system and have your radiator repaired or replaced. never mix your chemicals in the cooling system because there are 2 particular chemicals used in different products that when combined can blow up (nitro)

Posted on Nov 27, 2013

  • Grahame Begg Nov 27, 2013

    on reading the other comment, I want to clarify that I believe your thermostat is not opening and restricting your coolant flow. do the cheap things first by washing it out, the advice about the coolant is from 38 years in the trade in Australia

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Posted on Jan 02, 2017

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SOURCE: top radiator hose is HOT, radiator is steaming

have u replaced the radiator and hoses? Thermostat could also be stuck open. Water pump could also be your issue. with motor cool and of remove radiator cap(cap may be bad as well) top-off fluid and start car check for fluid flow with flashlight. Water pumps typically leak from what is called a weep hole when the shaft seal fails. Yours will be located under the timing cover (drivers side) running of the timing belt.
Hit me up after u have check on these.

Posted on Aug 15, 2009

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SOURCE: I have a 1996 Acura 3.2TL[V6] and it is overheating...

I had the same problem, whole new radiator, new hoses, new thermostat, and still overheating. What the problem was for me...bad radiator cap...all that money and a $20 fix...try it?

Posted on Oct 01, 2009

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SOURCE: Temperature gauge fluctuates

First of all you have a bad heater core that needs to be replaced. Second you may have a bad temperature sensor. Make sure the radiator if full of water

Posted on Jan 19, 2010

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