Please Help Urgent

[tonykreepy]

Just park my 93 after a 15 minute drive. Could hear water bubbling on reservoir and water coming out of little hose on top of reservoir.
What can this be????

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[tonykreepy]

Can it be bad thermostat

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[Honcho]

I hate to say this, but you may have a head gasket issue. This happened to me on my 91. Either the heads are lifting and allowing blow-by gas into the coolant (like my car), or the gasket has failed. In either case, this will flash boil the coolant and create steam voids that will propagate to the coolant tank, causing the blowout. Doubtful it is the thermostat because they usually fail open, not closed. I would buy a combustion gas test kit and test it on the coolant bottle. It's cheap, but will definitely confirm a blown head gasket or not. If not, you're boiling coolant somehow. The NSX can blow coolant out of the overflow tube, but only after several hard laps in hot weather where the stock cooling system cannot keep up. A 15 min drive around town is not enough to cause this behavior on a fully functional cooling system.

 

[Old Guy]

Did the engine overheat prior to being turned off? If the engine overheated then you have a number of potential problems.

In the event that the engine did not overheat, check the reservoir cap. The cap on the reservoir is the pressure cap for the cooling system. It will vent to relieve pressure (and spill coolant) if the engine overheats. However, if the cap is not secured properly, or the rubber seal on the cap has failed or is in poor condition or the relief mechanism in the cap has failed then the cap may relieve pressure prematurely or may not be holding any pressure at all. This may result in the coolant boiling when you stop the engine and coolant stops circulating (the temperature of the coolant will rise briefly when the engine is shut down). If you think it is a failed cap, after allowing the engine to cool top up with fresh coolant. If you vented a lot of coolant you may need to go through the whole process of topping up and purging the cooling system. Assuming a small loss of coolant replace with a new cap and do the start up and watch & listen check. Assuming the engine does not over heat and you don't have any further venting and boiling allow the engine to heat up and cool down and re check coolant levels.

One other thing to check is the motor oil. Any evidence of coolant mixed with the engine oil could be a sign that the head gasket failed. In such case call for a recovery vehicle and have it hauled to a repair shop.

 

[nis350]

wouldn't you get lot of smoke from the tailpipe with a blown head gasket?

I hate to say this, but you may have a head gasket issue. This happened to me on my 91. Either the heads are lifting and allowing blow-by gas into the coolant (like my car), or the gasket has failed. In either case, this will flash boil the coolant and create steam voids that will propagate to the coolant tank, causing the blowout. Doubtful it is the thermostat because they usually fail open, not closed. I would buy a combustion gas test kit and test it on the coolant bottle. It's cheap, but will definitely confirm a blown head gasket or not. If not, you're boiling coolant somehow. The NSX can blow coolant out of the overflow tube, but only after several hard laps in hot weather where the stock cooling system cannot keep up. A 15 min drive around town is not enough to cause this behavior on a fully functional cooling system.

 

[Honcho]

wouldn't you get lot of smoke from the tailpipe with a blown head gasket?

Not always. Could be a pinhole leak- my car had no smoke symptoms at all except for boiling coolant in the bottle and burping coolant out of the overflow tube. That's why it is best to buy a test kit and test the coolant bottle for combustion gas.