![]() ![]() In my case, as seen in Figures 10 and 11, it was a coolant hose leak. Once you have located the leak, figure out how to fix it. Let the pump hang at 19psi while you locate the leak As you can see in the image, there are no coolant tank leaks visible.įigure 9. While you are locating the leak you can leave the pump hanging as shown in Figure 9 and maintaining the pressure to 19psi for a few minutes. Now look for leaks again in the tank or under the car in the middle or near the radiator in the front. Step 6: The Boxster manual states the pressure should be at 19 psi in a warm engine, so pump the pressure up to 19 psi as shown in Figure 8. In my case, the coolant tank had no leaks and the undercarriage of the car started dripping at 15psi. Step 5: Start pumping the pressure up as shown in Figure 7 and look for leaks in the trunk near the coolant tank or below the car. The pressure in the gauge should be 0 psi.įigure 6. Step 4: Next attach the tube in the hand pump ( Figure 3) to the cap as shown in Figure 6. Using the radiator pressure test cap number 7 Make sure the cap is tightened by hand.įigure 5. ![]() Step 3: Now close the overflow tank with the cap number 7 ( Figure 2) from the radiator pressure test kit as shown in Figure 5. If the coolant cap is too tight or does not open easily, your engine may still be warm and try later until it is cold. Step 2: Open the coolant cap which may be blue or black and relieve the pressure in the system. Fill up the coolant overflow tank with distilled water till the MAX level indicator is reached.įigure 4. Step 1: Remove the carpeting and padding materials around the coolant overflow tank ( Figure 4) in the trunk. Make sure you perform this test when your engine is cold. To avoid such monetary loss, using just plain distilled water is a perfect substitute for performing the test. You also need to mix the Porsche coolant in a 50/50 ratio with distilled water before using it in your Boxster. In the 986 Boxster, the pink G40 coolant is very expensive, anything between 40$ per gallon to 68$ per gallon depending on where you purchase it from and whether you use the original Porsche brand or some after-market brand. While performing the leak test, if a few gallons of your coolant has already leaked out like mine did, you can use cheap distilled water instead to perform the test. Hand Pump in the kit Distilled Water 1-3 Gallon jugs - Amazon link or from your local automotive or grocery store The other main item in the radiator pressure test kit is the hand pump ( Figure 3) that attaches one end to the cap and can create pressure in the coolant system as though an engine was running warm.įigure 3. The pressure test kit carries several sized caps for the coolant or radiator tanks in a car so that the kit is compatible with several cars.įor the Boxster 986, you need to select the correct fitting cap which is number 7 in Figure 2.įigure 2. I purchased a radiator pressure kit from HarborFreight ( Figure 1) since it is close to where I live, but Amazon may have better deals for you and allows easier returns once you have completed the test ! Radiator Pressure Test Kit - Amazon link, HarborFreight link Here are the tools and materials you need to perform a pressure test in your coolant. To check for these you need to conduct a coolant pressure test without running the engine. Hoses have cracks or are loosely attached.There are many sources of a coolant leak in a 986 Boxster, but the most common are: This post demonstrates how easy this test is and how to go about doing it. To determine the correct cause of the coolant leak, I needed to conduct a coolant pressure test. The Boxster has 142,000 miles on it and the leak meant several possible things &emdash damaged hoses, failing water pump or cracked coolant tank. ![]() Turns out there was a major coolant leak and it was causing the engine to overheat. After driving it for about 1200 miles in the last 2 years, one day I saw the engine overheating light blink on the dash. ![]() Since buying the Porsche Boxster S, I had not done a coolant flush. ![]()
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