How to change your Porsche coolant pipes Cayman Boxster 997 crossover front coolant hose DIY at home

Porsche Cayman Boxster 987, 911 997 front coolant crossover pipe replacement. In this video, I show you how I changed my front coolant hoses on my 987.2 Cayman S. The two on the front left, and two on the right, as well as the two aluminium crossover pipes. I also replaced two smaller hoses which connect to the long aluminium pipes that run up the centre of the car. I also replace the seals on the hoses from the engine and two hoses which connect to the heater matrix.

This is quite a long job and requires some patience. Firstly you need to drop down the front subframe, this is easily done but you will need to get the wheel alignment checked afterwards. You can’t change these crossover pipes without dropping the subframe, trust me I tried. I read somewhere that some did, and all I can say is, there’s no way it would of went back together without something being broken or bent. It’s not worth the hassle, time messing around, so don’t even bother. Its 8 bolts to drop the subframe.

After replacing these hoses you will need to refill the coolant system. It’s takes approximately 15 litres of water/coolant depending on how much you lost/drained.

When bleeding the coolant system firstly open the bleed valve which is located next to the coolant reservoir/bottle. Open the bottle and fill with coolant, once full put the cap back on and then fill from the coolant filling cap next to the oil filler.

Run the engine and keep topping up the coolant, you will notice the engine temperature fluctuating, keep the heater temperature on high and keep checking it. You will need to rev the engine to about 3000rpm, keep revving and topping up, keep a count on how much water you have put in, this will give you an idea as to how much there’s left to go.

Parts I used and price in GBP at the time 2021

P99710662303 - B409B WATER HOSE SUP - £23.35
P99710662703 - B408D WATER HOSE RET - £29.71
P99710672803 - B302E WATER HOSE RET - £29.59
P99710662403 - B404E WATER HOSE SUP - £23.35
P99710672003 - B210 WATER PIPE - £43.23
P99710671103 - B210 WATER PIPE - £41.63
P99710672307 - A0104E WATER HOSE - £21.87
P99710655103 - B409F SLEEVE - £17.31
P99710672307 - A0104E WATER HOSE - £21.87
P99710655103 - B409F SLEEVE - £17.31
P99610680103 - F12B O-RING - £3.49 X4
P98710622230 - N/STK COOLANT HOSE - £12.65
P98710621230 - N/STK COOLANT HOSE - £13.49

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#crossover
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#garagetech

Porsche Cayman Boxster 2006 - 2012



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