My temperature gauge located in my speedometer is not working properly sometimes it goes up sometime down and sometimes it shows that engine is heated up but its not the reality...
SOURCE: 1987 Toyota motorhome 22RE engine cooling inconsistent
I think you have a leaking head gasket, very common on this engine.
SOURCE: temperature gauge is high but radiatior fan is working
The next thing and cheapest to check is the thermostat,then radiator and hoses.
SOURCE: Engine heats up but takes a long time for warm air
low fluid level or heater control valve may need replace..check hoses going to heater core...if cold...between heater control valve and heater core..replace control valve
SOURCE: Sometimes my temperature gauge goes
Check if the fan is running. You may also have blockage in the radiator or coolant is not circulating properly. I suggest first draining the radiator and inspecting if there are debris in the liquid that comes out.
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sorry its not 1988 its 1990 i don't know how 1988 got in question.
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