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

116,545

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

2 of 2 people found this helpful.
21,120

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.
26,985

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.
26,985

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.
2,170

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

Boxster

Looking for a Used Boxster in your area?

CarGurus has 1,246 nationwide Boxster listings starting at $4,995.

ZIP:

Porsche Boxster Experts

  • #1
    Stephen Smith
    Reputation
    490
  • #2
    Michael Kane
    Reputation
    360
  • #3
    Tim O'Meara
    Reputation
    290
View All

Related Models For Sale

Used Porsche 911
121 Great Deals out of 5,246 listings starting at $10,099
Used Chevrolet Corvette
116 Great Deals out of 16,009 listings starting at $3,995
Used BMW Z4
37 Great Deals out of 922 listings starting at $4,350
Used Ford Mustang
337 Great Deals out of 42,077 listings starting at $1,488
Used Porsche Cayenne
134 Great Deals out of 6,324 listings starting at $4,495
Used Mazda MX-5 Miata
58 Great Deals out of 4,068 listings starting at $2,088
Used Mercedes-Benz SL-Class
54 Great Deals out of 3,366 listings starting at $3,995
Used Mercedes-Benz SLK-Class
52 Great Deals out of 1,331 listings starting at $1,492
Used BMW 3 Series
1,140 Great Deals out of 33,943 listings starting at $1,209
Used Chevrolet Camaro
385 Great Deals out of 31,371 listings starting at $3,495
Used BMW M3
33 Great Deals out of 1,852 listings starting at $5,495
Used Nissan 350Z
25 Great Deals out of 1,137 listings starting at $3,495

Used Cars For Sale

2016 Porsche Boxster S For Sale
3 Great Deals out of 19 listings starting at $50,998
2015 Porsche Boxster S For Sale
3 Great Deals out of 64 listings starting at $42,999
2014 Porsche Boxster S For Sale
66 listings starting at $40,000
2013 Porsche Boxster S For Sale
55 listings starting at $27,000
2012 Porsche Boxster S For Sale
5 listings starting at $34,998

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.