MY 03 PORSCHE BOXSTER OVERHEATS AND LOSES COOLANT, WHAT IS WRONG WITH IT?

Asked by Jun 22, 2015 at 12:51 PM about the 2003 Porsche Boxster S

Question type: Maintenance & Repair

PORSCHE BOXSTER OVERHEATS AND LOSES COOLANT, WHAT IS WRONG WITH IT?
IT WILL LEAK OUT THE BACK BUT IM NOT SURE IF THATS THE OVERFLOW
LOCAL GARAGE SAY ITS NOT LOSING PRESSURE?
THEY THINK IT MUGHT BE BLOWING OUT THE CAP?
AND IT MIGHT BE THE GASKET?
HELP AND ADVICE PLEASE

6 Answers

104,115

Change the cap to a new one and see if that's the problem.

2 of 2 people found this helpful.
18,800

First I would try what joemom recommend and if that does not work I am going to recommend something you may or may not want to try but it worked for me. Lucas Radiator And Block sealer. No promises but it has been working for me for a year now and still no leak. By all means this is not a permanent fix but may hold you over long enough to save the funds to do it right. One more thing if it does not work the first time do not continue to add more hoping it will work it will cause more problems like clogging up your cooling system. If you do decide to try it hope it works for you like it did for me.

1 of 1 people found this helpful.
24,805

It could be your overflow tank it seems to be a weak point in the Boxster cooling system. Heres a video that shows how to test and find the leaks: https://www.youtube.com/watch?v=5WrgWIVFnpw

2 of 2 people found this helpful.
24,805

Heres a link to the OE replament part if that turns out to be the problem. http://www.partsgeek.com/gbproducts/WC/131-01136567.html?utm_content=YN&utm_term=1997-2006+Porsche+Boxster+Expansion+Tank+Original+Equipment+W0133-1647661+97-06+Porsche+Expansion+Tank+2004+2005&fp=pp&gbm=a&utm_source=google&utm_medium=ff&utm_campaign=PartsGeek+Google+Base&gclid=CLmmnsq4pMYCFdcZgQodVIANlQ

1 of 1 people found this helpful.
1,720

Check your hoses and clamps running to the pipes going to the front of the car. On shut down, the engine heat soaks, and raises the pressure enough to cause a leak. The water pump is also a suspect, but it's easy to change. Good luck!

205

Left carpet in trunk and check if there is coolant. If "yes" you need to change out the coolant tank - a bad design, make sure you have the tank pressurized after refilling coolant.

Your Answer

Add photo

Related Questions

Boxster

Looking for a Used Boxster in your area?

CarGurus has 1,146 nationwide Boxster listings starting at $3,920.

ZIP:

Search Porsche Boxster Questions

Porsche Boxster Experts

#1 Michael Kane
Michael Kane
Reputation 310
#2 Stephen Smith
Stephen Smith
Reputation 270
#3 Andrew Dickens
Andrew Dickens
Reputation 250
View All

Related Models For Sale

Used Porsche 911
91 Great Deals out of 4,513 listings starting at $10,500
Used Chevrolet Corvette
149 Great Deals out of 20,684 listings starting at $3,995
Used BMW Z4
32 Great Deals out of 1,052 listings starting at $4,650
Used Ford Mustang
541 Great Deals out of 45,846 listings starting at $1,999
Used Porsche Cayenne
104 Great Deals out of 5,225 listings starting at $3,999
Used Mazda MX-5 Miata
43 Great Deals out of 3,935 listings starting at $2,985
Used Mercedes-Benz SLK-Class
45 Great Deals out of 1,210 listings starting at $2,000
Used BMW 3 Series
945 Great Deals out of 30,262 listings starting at $1,000
Used Mercedes-Benz SL-Class
45 Great Deals out of 2,814 listings starting at $4,530
Used Chevrolet Camaro
243 Great Deals out of 31,194 listings starting at $369
Used BMW M3
50 Great Deals out of 1,361 listings starting at $3,800
Used Nissan 350Z
52 Great Deals out of 1,206 listings starting at $2,899

Used Cars For Sale

2016 Porsche Boxster S For Sale
12 listings starting at $62,400
2015 Porsche Boxster S For Sale
38 listings starting at $51,981
2014 Porsche Boxster S For Sale
3 Great Deals out of 76 listings starting at $46,999
2013 Porsche Boxster S For Sale
44 listings starting at $36,500
2012 Porsche Boxster S For Sale
6 listings starting at $36,900

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.