Question about Subaru Cars & Trucks
I have been driving my 1999 subaru, 2.5L across the country from SC and when I stopped for food it overheated and was idling really rough. I am now neat Denver, CO
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Posted on Jan 02, 2017
The 97-99 2.5L DOHC Subaru engines were notorious for this problem, blown head gasket is very likely the cause. It is possible to test for the presence of exhaust gas in the coolant to verify. The reason the car seems to be overheating then cools down quickly when shut off is that the hot exhaust gas displaces the coolant at the top of the engine where the sensor is. If it happens consistently you will need to deal with it, I have worked on an engine that was run many miles under this condition and it damaged the block beyond repair. If you are a decent shade-tree mechanic, it is possible to do the work with the engine still in the car, you will have to raise it up an inch or two to get sufficient access. I have personally done 3 engines with this problem, a 98 and 2 99's.
Posted on Jan 19, 2009
cool air and overheating point to low coolant level. Do you have a bleeder valve near the thermostat? You may have air trapped in the system. If no air trapped, the radiator may be plugged up not allowing proper circulation of coolant.
Posted on Mar 24, 2009
The coolant is going somewhere, and a possible explanation is that it's going out in your exhaust gases due to a failed cylinder head gasket.
Check the oil for any mayonnaise; this may be present under the oil cap or on the dipstick: it's emulsified coolant and oil and is pretty obvious. Also get the car "sniff-tested" by a garage. This is a cheap simple test where they take a small sample of coolant and shake it in a tube with a little reagent. If there are exhaust gases in the coolant there's a colour change and it confirms a blown gasket.
Get this done immediately. A failed head gasket is expensive enough to start with, but it will not fix itself and the bill for damage to other parts only increases steeply if left unattended.
If the tests prove negative then you may have a hole in the radiator or pipes somewhere, if the coolant escapes as steam then you won't necessarily have any puddles. Although this fault is far cheaper to fix, the overheating it causes is the main cause of head gasket failure so again you need to get this checked and fixed without delay.
Posted on Mar 12, 2010
I have the same problem!Running on three.I have checked compression,wires,plugs.Changed injecters,plugs.
3 mech.cant figuire it out???
Posted on Aug 01, 2010
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