# Overheating **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** outback, subaru\ **Created:** [December 14, 2010, 6:30pm UTC](https://community.cartalk.com/t/overheating/58713 "2010-12-14T18:30:01Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![nyash48](https://avatars.discourse-cdn.com/v4/letter/n/90db22/32.png) [@nyash48](https://community.cartalk.com/u/nyash48)\ **Post date:** [December 14, 2010, 6:30pm UTC](https://community.cartalk.com/t/overheating/58713/1 "2010-12-14T18:30:01Z")
I have a 2000 Subaru outback, every time I drive over 65mph the car start overheating, if I slow down the gauge goes down. I replaced the water pump, thermostat, and radiator and the problem is not going away. Both fan are working. Hope this is related or may help- Seem to add about a quarter a gallon every other day. Also if I open the radiator cap after a along drive there is no pressure coming out of the radiator. ---
**Author:** ![tardis](https://avatars.discourse-cdn.com/v4/letter/t/f0a364/32.png) [@tardis](https://community.cartalk.com/u/tardis)\ **Post date:** [December 14, 2010, 6:39pm UTC](https://community.cartalk.com/t/overheating/58713/2 "2010-12-14T18:39:03Z")
Head-gasket? ---
**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\ **Post date:** [December 14, 2010, 6:41pm UTC](https://community.cartalk.com/t/overheating/58713/3 "2010-12-14T18:41:12Z")
It sounds like either you have a coolant leak somewhere within the pressurized portion of your system or your pressure cap is failing (optimistic guess). Another good possibility is a blown headgasket (pessimistic guess). Have the cooling system pressure checked, and either replace the radiator cap or test it. Also, check your coolant for evidence of hydrocarbons and/or have a pressure leakdown test done on the cylinders. Post back with the results. ---
**Author:** ![nyash48](https://avatars.discourse-cdn.com/v4/letter/n/90db22/32.png) [@nyash48](https://community.cartalk.com/u/nyash48)\ **Post date:** [December 16, 2010, 6:35pm UTC](https://community.cartalk.com/t/overheating/58713/4 "2010-12-16T18:35:10Z")
I replaced the radiator cap, so I am not loosing any more coolant, but now I get coolant odor when i have the heat on. Sometimes when I drive on the highway it start overheating but if I slow down it cools down. ---
**Author:** ![MikeInNH](https://avatars.discourse-cdn.com/v4/letter/m/a587f6/32.png) [@MikeInNH](https://community.cartalk.com/u/MikeInNH)\ **Post date:** [December 16, 2010, 7:40pm UTC](https://community.cartalk.com/t/overheating/58713/5 "2010-12-16T19:40:47Z")
Tardis may be right…Known problem with that year Sub… ---
**Author:** ![Goldwing](https://avatars.discourse-cdn.com/v4/letter/g/e68b1a/32.png) [@Goldwing](https://community.cartalk.com/u/Goldwing)\ **Post date:** [December 16, 2010, 8:15pm UTC](https://community.cartalk.com/t/overheating/58713/6 "2010-12-16T20:15:32Z")
Leaking heater core? ---
**Author:** ![ignoramus9](https://avatars.discourse-cdn.com/v4/letter/i/d07c76/32.png) [@ignoramus9](https://community.cartalk.com/u/ignoramus9)\ **Post date:** [December 16, 2010, 11:18pm UTC](https://community.cartalk.com/t/overheating/58713/7 "2010-12-16T23:18:10Z")
burp the top radiator hose after you fill the tank and run the engine up to normal temp. Also check for a partially clogged thermostat, and if there is a clutch fan on the pump, make sure it is working right, if electric fans, are you sure they are turning on and off at the proper times? ---
**Author:** ![nyash48](https://avatars.discourse-cdn.com/v4/letter/n/90db22/32.png) [@nyash48](https://community.cartalk.com/u/nyash48)\ **Post date:** [December 17, 2010, 2:44pm UTC](https://community.cartalk.com/t/overheating/58713/8 "2010-12-17T14:44:35Z")
I replaced the thermostat but seems the electric fan are not turning on regularly.