overheating(help)
overheating(help)
I put a new radiator,w/pump,thermos stat,and hoses on my 91'240sx.When I start it the goes to normal then after a few minutes goes to just below hot then slowly comes back down to normal then stays.Is this normal???????????
No.
It is likely one of two things:1) Your new t-stat is defective and not opening at the proper temperature; or (more likely)2) You have an air bubble in the coolant flow of the engine, as a result of changing the radiator/hoses etc. and refilling the engine up with coolant. Do a search and look up how to "burp" or "bleed" the coolant system, there's a bleed screw on the manifold.
It is likely one of two things:1) Your new t-stat is defective and not opening at the proper temperature; or (more likely)2) You have an air bubble in the coolant flow of the engine, as a result of changing the radiator/hoses etc. and refilling the engine up with coolant. Do a search and look up how to "burp" or "bleed" the coolant system, there's a bleed screw on the manifold.
lift the front of the car up as high as possible, or park on an extreamly inclined road front pointed up. remove rad cap. remove the bleader screw on the front of the manifold near the 2 ground wires. fill rad till coolant comes out bleader hole. reinstall the screw ,continue to fill the radiator till its full. start engine and allow it to get to operating temp. top off fluid as you see it drop untill it wont take any more then install cap and road test.
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MaineExport
- Posts: 3784
- Joined: Tue Jul 23, 2002 3:27 pm
- Car: 95 Nissan 240SX FAL fans AEM intake Hot Shot header Apexi N1 dual Exhaust VLSD ABS NX 50 shot
meantime's got it I think. The usual culprit is an air pocket in the coolant, but defective thermostats are quite common. I had similar problems so I replaced the thermostat first... still over heated... replaced the water pump... still overheated... bled the lines 8 TIMES!!! and still overheated. Finally decided to take out my brand new thermostat... boiled it in a pot... NEVER OPENED UP!!! bought another new one and it hasn't had a problem since.
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Structure240sx
- Posts: 5615
- Joined: Sun Oct 06, 2002 5:04 pm
yea i jsut put in a new one and tested it in a pot of boilin water to check it which i heard from somewhere on nico before and yea it opened. when ur car is heated up grab the lower radiator hose and if its hot and hard (ha) the thermostat is open. if its cool and soft u dont know how to work it (ha)