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| 986 2.7 Coolant Boiling Over http://forums.tipec.net/viewtopic.php?f=10&t=23071 |
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| Author: | madrob6 [ Mon Dec 04, 2017 2:27 pm ] |
| Post subject: | 986 2.7 Coolant Boiling Over |
I picked up a 02 986 2.7 that needed a new water pump recently. I've now changed the pump for a piersburg one but I'm still getting some issues when in traffic. When driving along normally it's absolutely fine however when sat in traffic things start going a bit wrong. I can hear the radiator fans come on briefly which is fine. The temp needle never strays much above the 80 mark however when sitting in traffic for too long I'll hear the fan in the engine bay kick in, smell the unmistakeable smell of hot coolant and eventually I'll be leaving a trail of the stuff behind me as it overflows out of the coolant tank. I've just ordered a new cap in the hope that that's going to fix the problem but does anybody have any other ideas? I've tried bleeding the system repeatedly but it never seems to make much difference. The thing that's confusing me the most if that the engine doesn't overheat at any point. I'd be expecting the temp to be through the roof for the coolant to overflow. I haven't had the car for long and don't have a garage handy in order to do too much investigation (especially not in this weather!). |
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| Author: | Sean Smallman [ Mon Dec 04, 2017 2:48 pm ] |
| Post subject: | Re: 986 2.7 Coolant Boiling Over |
Cracked expansion tank would be my guess. They open up when they get hot. |
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| Author: | madrob6 [ Mon Dec 04, 2017 3:20 pm ] |
| Post subject: | Re: 986 2.7 Coolant Boiling Over |
I'm hoping not purely due to the cost of a new one. Would be cheaper to finally replace the knackered wheel bearing on the 944 and use that for a bit if that's the case. Need to get around to digging everything out of the boot but won't be seeing the car in daylight for a few weeks sadly. |
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| Author: | tr7v8 [ Tue Dec 05, 2017 3:28 pm ] |
| Post subject: | Re: 986 2.7 Coolant Boiling Over |
Needs the fans and resistors investigated. Both can be an issue. However when mine used to brew up it was because the DME was knackered and not triggering the fans on. If it has a/c switch that on and see if the fans at the front run at top speed, they should. Other options are the header tank as Sean said. A pig to swap. |
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| Author: | madrob6 [ Thu Dec 07, 2017 12:37 am ] |
| Post subject: | Re: 986 2.7 Coolant Boiling Over |
After the last incident I parked it on a bloody steep hill and went for another bleeding of the system. I've not had any issues since but I ordered a new cap for the hell of it. Got the cap tonight and have been running around town, sat around idling, going for a bit of a hoon then sitting around a bit more. All seems absolutely fine. If anything the fans have stayed on for longer than they have before and the engine bay fan didn't turn on at all. Looks like it was probably the bleeding but changing the cap can't have hurt. I did have the .01 but now have .04. I miss having an MR2. When that needed bleeding you knew about it because it sounded like you were driving over a mine field and to bleed it you opened a couple of valves and attached the Toyota supplied hose to each one. At least the Boxster has more grunt, a better sound, and more creature comforts. |
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| Author: | tr7v8 [ Thu Dec 07, 2017 8:54 am ] |
| Post subject: | Re: 986 2.7 Coolant Boiling Over |
The caps were an issue, hence the different revisions. Surprised that there are any old ones left installed. Glad you'be sorted it though |
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| Author: | Sean Smallman [ Thu Dec 07, 2017 4:33 pm ] |
| Post subject: | Re: 986 2.7 Coolant Boiling Over |
Well done, pleased that it is sorted. |
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| Author: | JasonGibson [ Sat Dec 09, 2017 10:17 pm ] |
| Post subject: | Re: 986 2.7 Coolant Boiling Over |
Replacement cap sorted mine too |
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| Author: | madrob6 [ Mon Jan 15, 2018 2:21 pm ] |
| Post subject: | Re: 986 2.7 Coolant Boiling Over |
Just a quick update on this. I replaced the coolant cap and also spent a while on a rather steep hill bleeding the system further and all seems well now. Well apart from the poor people who live on that hill, I did the same for my 944 the weekend after so they must love me now 
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