Heating the passager cabin is done by piping in hot water from the engine's cooling system to the heater core under the dash where the controls for the heating and air conditioning are. The heater core looks like a miniature radiator similar to the one that is in the front of the the vehicle behind the grille to cool the engine down. There is a fan behind the heater core that blows air across it and is directed into ducts to blow out at the vents on the dash that you can position where you want the heated air to go.


Sometimes these cores leak just like a radiator and spill antifreeze on the floor of the vehicle or leak outside on the ground.

If this happens the core has to be replaced.

Putting stop leak in the cooling system will stop the leak temporally but is not a recommended fix as it can plug up other passages in the engine's cooling system. 

Hours of Operation:


Monday - Friday: 9:00 AM - 5:30 PM


Saturday's by Appointment


​Night Drop off available


(541) 754-5310

Greg's Auto Service

440 SW Wake Robin Ave.

Corvallis, Oregon 97333

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From downtown Corvallis:

 1. Drive SOUTH on SW 4th St (US-20)

This a ONE-WAY street heading SOUTH


 2. Take left underpass onto SW 3rd St (OR-99W S) toward Junction City/Eugene (go 1.4 mi) You will travel through two traffic lights. The second is in the Lincoln School speed zone. 20 mph on school days.


 3. Turn right onto SW Wake Robin Ave (go 0.2 mi) This is the first right turn after Park Ave. The shop is on the left before the tracks.