1990 Nissan Truck blowing steam

1990 NISSAN TRUCK
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FRANKAWESTON
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1990 Nissan Truck 6 cyl Four Wheel Drive Manual 269+ miles
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i start the truck and drive for about 2-3 miles.everythink is ok.then at about the 4th mile it starts steaming from the reservoir. When i pull over pop the hood and eventhough the steam is soo hot i can pull off the cap and their is very little pressure.now when i shut the truck off it starts to slowly steam and with in a few seconds it's steaming so much u can't even see the engine.

the weird thing is,the steam is very very hot, but the radiator and water is't. so if you could lead me in the right direction I would be thankful.

ohh by the way can you tell me where the thermostat is located and how many gallions of fluid the truck will take

just for haha's i checked the oil level and felt the dip stick and it was luke warm...........thanks Frank W
Dec 17, 2007 at 10:28 PM
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RASMATAZ
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Lets get the following below tests done

Sounds like a blown headgasket

Have it block and pressure tested-do the block first to pinpoint a combustion leaking into the cooling system or a gas analyzer to sniff for hydrocarbons at the radiator fill neck.

Pressure test: do not do a pressure test if there's leakage at the headgasket this might cause coolant into the cylinders and lock it up or bend a connecting rod if cranked thereafter. The headgasket should be repaired before doing the pressure test.

If the block and pressure test passes check the following: Thermostat,Pressure test the Rad. cap,Clogged radiator,Fan clutch,Radiator electrical fan,collaspe hoses,water pump.
Dec 17, 2007 at 10:32 PM