Having problems with your 1999 Subaru Legacy ?

Have a 1999 subaru outback legacy it warms up for 15 to 30 min just fine. When you go to drive at first its fine by the second block its overheated. The car is going through coolant and water really fast but none is spilling on the ground any ideas?

Posted / edited by AnonymousUser on : 12-04-2021

Answers :

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.
This vehicle is known for faulty headgasket (bad design).

If it is blown, coolant will seep into the cylinders and be burned off with the gas. You could also have a cracked head - in essence creating the same problem.
Check the compression of each cylinder to see.

Also a good indicator is oil in the overflow reservoir - and smoking tailpipe on startup (white smoke) - also increased temp as you have indicated - as the exhaust is leaking back into the coolant as well.

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Repair Help & Product Troubleshooting for 1999 Subaru Legacy

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