Question about 1996 Subaru Legacy
Codes indicate a new coolant temp sensor is needed. Temp gauge is very slow to indicate anything. do these things relate or is a thermostat also indicated.
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Posted on Jan 02, 2017
SOURCE: engine overheat
Hi and welcome to FixYa,
Offhand it would appear that the radiator fan is not working. In some versions, either the A/C or the heater must be turned on for the radiator fan to work. In some other incidents, the fan utilizes a clutch. Common design makes use of the inverse property of silica oil to serve as the clutch. Still others have a relay that actually does the switching on of the fan. Of course it would be to your advantage to likewise check the temperature sensor on the radiator.
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Posted on Dec 07, 2008
SOURCE: Temperature Gauge Always On Cold
As long as your gauge is still moving up, there's no real problem. You have heat coming from the heater. It's only a problem if it's getting too hot. What's going on is that you don't let the vehicle run long enough, and it's so cold outside that the engine stays cold. It raises in temp when your stopped because there's no airflow through the radiator. The thermostat just heats up the engine block, and won't change the reading on the gauge. When this goes bad your car will overheat in just a few miles.
Posted on Mar 26, 2009
if it overheats while your in motion then u can eliminate your fans, as your problem. and do you mean 5-50 thousand miles? id chech your coolant for hc contamination. most likley a head gasket
Posted on Apr 05, 2009
Was the water pump brand new or rebuilt? I have seen rebuilts fail on the first test drive.
Before pulling the head, I would take it to a shop and request a CO2 test to check for combustion gasses in the cooling system. Shouldn't cost more than $30 and is a pretty definative test.
Posted on May 18, 2009
Since you changed your waterpump, you need to do an air bleed...
This is INSANELY important!
The airbleed is mounted on the top of the radiator on the passenger side.
Its made of plastic, has a seal, and looks like a 1/2 inch (12mm) philips screw head.
To do this, make sure the engine is cold and not running.
Use a large FLAT HEAD screw driver and turn it counter clockwise.
It might be very tight, so be prepared for a bit of torque to turn it!
Unscrew it, and look in the hole.
Coolant should be at the top of the bottom of the screw hole.
It should be low, so add coolant to the open hole.
While doing this, be sure the radiator cap is off so you can balance the fluid level properly.
Why do you need to bleed the system?
The engine has a slight tilt upwards toward the radiator, and both your waterpump, and block will have a tendancy to leave air near the top of the block and heads.
This is a common mistake on several makes after a coolant change.
Make sure all fluids are topped off, fill the overflow tank to its max level indicated on the tank itself and your done.
Provided you havent been driving long on the car in this condition, it shouldnt blow a headgasket.
A good way to know if the headgasket is bad is the radiator cap will have a brownish "slime" indicating combustion gasses are getting into the cooling system.
IF this is the case, your engine is pumping combustion gasses into your system and no amount of air bleeding with help.
Another tell tale sign of coolant being pressurized, is a overflowing "overflow" tank, and a sudden blast from Normal operating temprature to HOT, and then suddenly.. it goes back to Normal again.
There is usually a "gurgling" sound under your dash..
Lets assume you just need to do an air bleed, and things will go back to normal.
Also, if your airbleed screw has alittle coolant leaking around it, replace it with a new one as the seal and plastic have worn due to age.
Posted on Aug 28, 2009
Tips for a great answer:
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The IPC detects a loss of serial data communications with the ECM.
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A DTC will be set if an abnormal reading occurs, P0116 for sensor performance, P0117 low input or
P0118 for a high input. The coolant temperature sensor temperature reading should closely match the
air charge/manifold temperature reading on a scan tool if the engine has not been run for over an hour.
The sensor circuit can be checked for proper voltage using a voltmeter.
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