Your thermostat might be sticking. If you haven't replaced it try that, They are cheap. I need to change the one on my truck now, It runs cold (no heat in the winter.
When you said you replaced everything, did that include the temperature sending unit?
The temperature sensor just operates the cooling fan or fans for the radiator.
The temperature sending unit operates the temperature gauge in the dashboard. If that thing is faulty, the gauge won't work right.
If you did change the sending unit, it could be possible that the computor is screwing it up, but in my 41 years as a mechanic I never heard of it, when a computor goes, nothing works.
I have a 1998 saturn 1.9 i'm having problems with antifreeze coming out from the reservoir i've changed the coolant temperature sensor and changed the relay fuse located inside the engine yet nothing changed now i,ve begin to notice smoke coming from the exaust. please tell me what i need to do.
SOURCE: 1998 Saturn SL2 engine light
Possible Causes
The following are malfunctions that could cause a rich condition:
^ Fuel pressure too high. Perform fuel pressure test.
^ Leaking fuel injector(s). - Perform pressure leak down test.
^ Vacuum leak around the MAP sensor grommet.
^ Oxygen sensor contamination.
^ Restricted exhaust or air intake.
^ Fuel Vapor Canister saturated with fuel.
IMPORTANT: If the front oxygen reading voltage is above 600 mV and the rear HO2S is above 600 mV all the time, the O2 sensors are probably not
at fault.
SOURCE: I own a 1999 Saturn SL2 sedan. The car is losing
You have done everything right so far. Sometimes water leaks out when the engine is hot and evaporates almost instantaneously, a classic point is the seal on the water pump pulley shaft. To find such a leak you need to pressure test your coolant system. The normal operational pressure of a coolant system is 7lbs/sqinch at running temperature. The pressure test will put in 11lbs/sqinch and then monitor this over some time looking for a bleed down due to the leak. If a leak exists to the exterior of the engine you should be able to spot the seepage. The next test will be to run the engine up to normal temperatures and to monitor the pressure, if the pressure jumps to 15lbs/sqinch when still cold then this indicates an internal gasket leak as exhaust gases are pushing out of the cylinder in to the coolant. One check to make is to remove the plugs one at a time and inspect them. Sometimes if water leaks into cylinder it has the effect of 'washing' the specific spark plug clean.
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