expand_moreCooling fan is switched off at temperature
expand_more2.6 with gasoline V6 2.6 L 148 HP, 225 N⋅m engine (1995.1–2000.11)
First stage
183.2°F183.2°F84°C
Second stage
195.8°F195.8°F91°C
expand_moreAll other modifications
First stage
183.2–195.8°F183.2–195.8°F84–91°C
Second stage
195.8–208.4°F195.8–208.4°F91–98°C
expand_moreCooling fan is switched on at temperature
First stage
197.6–206.6°F197.6–206.6°F92–97°C
Second stage
210.2–221°F210.2–221°F99–105°C
expand_moreRadiator cap opening pressure (Cooling system maximum pressure)
2.4 with gasoline V6 2.4 L 161 HP engine (1997.8–2000.11)
1.18–1.48 atm.1.2–1.5 bar1.2–1.5 bar
2.4 with gasoline V6 2.4 L 161 HP engine (1997.8–2000.11)
1.18–1.48 atm.1.2–1.5 bar1.2–1.5 bar
2.4 with gasoline V6 2.4 L 161 HP engine (1997.8–2000.11)
1.18–1.48 atm.1.2–1.5 bar1.2–1.5 bar
2.4 with gasoline V6 2.4 L 162 HP engine (1997.3–2000.11)
1.18–1.48 atm.1.2–1.5 bar1.2–1.5 bar
2.4 with gasoline V6 2.4 L 162 HP engine (1997.3–2000.11)
1.18–1.48 atm.1.2–1.5 bar1.2–1.5 bar
2.4 with gasoline V6 2.4 L 162 HP engine (1997.3–2000.11)
1.18–1.48 atm.1.2–1.5 bar1.2–1.5 bar
2.4 with gasoline V6 2.4 L 162 HP engine (1997.3–2000.11)
1.18–1.48 atm.1.2–1.5 bar1.2–1.5 bar
2.4 with gasoline V6 2.4 L 162 HP, 230 N⋅m engine (1997.3–2000.11)
1.18–1.48 atm.1.2–1.5 bar1.2–1.5 bar
2.6 with gasoline V6 2.6 L 148 HP, 225 N⋅m engine (1995.1–2000.11)
1.18–1.48 atm.1.2–1.5 bar1.2–1.5 bar
2.8 with gasoline V6 2.8 L 190 HP at 3200 RPM, 280 N⋅m at 3200 RPM engine (1996.10–2000.11)
1.18–1.48 atm.1.2–1.5 bar1.2–1.5 bar
2.8 with gasoline V6 2.8 L 190 HP at 6000 RPM, 280 N⋅m at 3200 RPM engine (1996.10–2000.11)
1.18–1.48 atm.1.2–1.5 bar1.2–1.5 bar
2.8 with gasoline V6 2.8 L 190 HP engine (1996.10–2000.11)
1.18–1.48 atm.1.2–1.5 bar1.2–1.5 bar
2.8 with gasoline V6 2.8 L 190 HP engine (1996.10–2000.11)
1.18–1.48 atm.1.2–1.5 bar1.2–1.5 bar
2.8 with gasoline V6 2.8 L 190 HP engine (1996.10–2000.11)
1.18–1.48 atm.1.2–1.5 bar1.2–1.5 bar
2.8 with gasoline V6 2.8 L 190 HP engine (1996.10–2000.11)
1.18–1.48 atm.1.2–1.5 bar1.2–1.5 bar
All other modifications
1.38–1.58 atm.1.4–1.6 bar1.4–1.6 bar
Thermostat opens at temperature
188.6–215.6°F188.6–215.6°F87–102°C
Overheating is really dangerous for Audi A4 engines. Regularly check coolant level in the overflow reservoir. If the coolant level drops below minimum level inspect the cooling system for any signs of leakages and replace worn or damaged hoses. Use correct thermostat for your car.
Please be noted that all capacities listed here are approximate. Check fluid levels when adding or refilling as recommended in your 1998 Audi A4 user's manual. Keep in mind that all information here is provided “as is” without any warranty of any kind.
Before doing any DIY service please check your insurance policy and Audi warranty policy for your region. In some regions DIY service may invalidate your warranty.
DIY car service is not as difficult as it looks like and it might save you thousands of dollars per year. It might be even fun and a good thing to do with your kids on a weekend to teach them how basic machinery works. It's really hard to screw something up and damage your car permanently if you use right tools, follow Audi A4 service manual and use right parts and fluids in prescribed amounts. Even modern cars stuffed with electronics can be serviced in your garage or even in your driveway. Changing engine oil, brake fluid, ATF, replacing brake pads, and etc. It's all may be done by yourself in a mater of a couple of hours.
Doing basic service for your 1998 Audi A4 you're not only saving money, but also also improving your technical skills and learning something new.