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MY 2009 Porsche Boxster temp gauge goes to 300 and a

Customer Question
indicator light comes on and the...
MY 2009 Porsche Boxster temp gauge goes to 300 and a indicator light comes on
and the information says check coolant
Submitted: 6 months ago.Category: UK Car
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Customer reply replied 6 months ago
Which coolant do I use and how do you check the level?
Customer reply replied 6 months ago
how do you check the level of coolant and which coolant do i add?
Answered in 17 minutes by:
1/6/2018
UK Auto Mechanic: Matt, Mechanical Engineer replied 6 months ago
Matt
Matt, Mechanical Engineer
Category: UK Car
Satisfied Customers: 23,305
Experience: BEng hons Mech engineering, in auto industry 22 years
Verified

Hello and welcome to Just Answer

the coolant tank is accessible via the engine access hatch

if you look at the image you should have a point with the oil, coolant (blue cap) and oil dipstick all in the same place

see the attached image

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UK Auto Mechanic: Matt, Mechanical Engineer replied 6 months ago

image attached

if the coolant is OK then replace the thermostat in the engine.

Whilst the thermostat is being replaced you might as well also reverse flush the cooling circuit (remove top hose to rad and use a hosepipe to push water into the engine until you get clear water out of the radiator hose) and top up with 30-50% fresh antifreeze. Also check that the small diameter bleed hoses that run from the top of the radiator and the top of the engine aren't blocked as this allow the air to vent back to the header tank automatically.

If you still have a problem then check that the water pump impeller / turbine isn't spinning on its shaft. You should be able to achieve this by removing the bottom hose from the engine and use a screwdriver or similar to feel for the water pump impeller blades, whilst your assistant turns the engine over by hand.
If you can stop the impeller with slight pressure from the screwdriver the pump needs replacing.

Also its possible the belt is slipping so its worth replacing its especially if the rubber ribs are cracked or it looks shiny on flat side of the belt - while its off check that the tensioner and other pulleys all spin freely the exception to this is the AC pump ( if fitted)

I'd also suggest ensuring that you've got all the air out of the system as this sort of episode can leave pockets of air trapped and prevent the coolant from circulating properly.

So check that the small hoses that run from the top of the engine and radiator that run back to the header / expansion tank are free flowing and not blocked

If these are OK then remove the tank pressure cap and run the engine from cold with the heater set to full hot

As the engine starts to warm, squeeze the large hoses running to the radiator to help displace any air - all the time keeping an eye on the level in the header tank, making sure it doesn't drop below the minimum and open any bleed screws built into the top cooling hoses - closing them off as soon as they start to gush water

Once the engine is up to temperature the tank should be quite full. Switch the engine off and leave it to cool

Then top up to the mark once its all cold and replace the cap

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UK Auto Mechanic: Matt, Mechanical Engineer replied 6 months ago

Hi
do you still need help?
Bear in mind that the site takes a deposit from you at the beginning and this is held by the site until you rate my answer at which point the cash is split between the site and the expert. I am only paid for my work on this question if you rate my answer, using the star system at the top of the screen. Please do not forget! If you're not pleased, also let me know because rating bad does not result in a refund, there are better options. Rating now will not close this post nor prevent further replies
Thanks Matt

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