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New thermostat but car is still overheating - Maxima Nissan Cars & Trucks

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Maybe your radiator veins are blocked try flushing your radiator,

Posted on Jan 18, 2013

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Posted on Jan 02, 2017

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SOURCE: 1998 subaru outback 2.5 still

The thermostat is not the only possibility for this problem.The thermostat is one of the possibility for overheating.If thermostat is replaced, but still the overheating problem is not solved, then get the coolant level checked.If the coolant is low, the engine will overheat.If coolant is leaking a bit, the engine will overheat.Get the radiator cap checked.If its loose or worn out,m the pressure will get released and it will overheat. ----------- Other possibility can be air in system.after replacing, the thermostat, the air has to be bleeded. park the car on flat ground - take the cap off the radiator and let the car idle for a while and add coolant as needed till you burp out all the air in the system. Make sure the coolant system is full first. The gauge may go up to hot until you get all the air out. Leave the radiator cap off, start engine, keep adding fluid till the engine warms up and pushes fluid out, then put the cap on and drive till the engine is warm, then cool off, add more fluid, repeat, till it stays full. You will get bubbles in the overflow tank until all the air is out.--------- as you mentioned head gasket replaced.But still get heater core and head-gaskets checked.------------

Start by checking the coolant. As we already said coolant is what warms the heater core. So if the coolant is low, there may not be a sufficient amount of warmth to transfer heat to the air in the passenger compartment.Once the coolant is full, feel the heater hoses that go through the firewall. With the engine at normal operating temperature, BOTH of the heater hoses should be hot to the touch. If only one is hot, this indicates there is is a blockage in the heater core or there is air trapped in the heater core.One hose hot, one cold, points to a plugged heater core.If this is the case,try flushing the heater core.There are no valves in the heater core; it is free flow at all times.Also check the head gasket. just because there is no water coming out of the exhaust dos,nt mean the head gasket is ok.How much pressure is in the system?.Are the water hoses very hard when the engine is hot?.......air in the system will stop the heater from working.------------Also try this procedure to clean the block in the heater core.If there is any:--- Put in a cleaner, Prestone, and drive car few hours.Then check if nNo success. Then get cleaner made by Gunk.You can get it from any local auto part store. Drain heater core, leave both heater hoses attached to the heater. Remove other ends of both hoses from the tubes on the thermostat housing and raise these ends above the heater core. Pour Gunk cleaner in one hose and add water until cleaner started to come out other hose. Leave this sit 4 hours and back flush heater core in both directions. Next back-flush block and radiator in both directions. Water should come out of tube on the thermostat housing that has a hose attached to the outlet of the heater core.If not coming then Flush water directly into this tube about 15 to 20 times and you will hear a thud of water coming out. Back flush block and radiator again and this time water should out the tube previously blocked. But if problem is same and no difference.Then is faulty heater core.Its causing the problem and it needs to be replaced.Also check the radiator,if its blocked then get the radiator back flushed too..------------ This should help.Thanks.Helpmech.

Posted on May 05, 2011

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