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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHNew Coolant Reservoir Cap Failed?
Leading reported evidence
Replace expansion tank
Performed · outcome unconfirmed
No successful repair reported for this finding.
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1
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Read evidence and context
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Performed · outcome unconfirmed
Looking at the service history, two years ago the PO replaced the expansion tank.
Leading evidence: 'Replace expansion tank' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check page' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed
I'd say it is imperative the AOS be replaced given the slightest sign of any problems.
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Suggestion
This s good check page to see if you have the appropriate cap for the car
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Suggestion
Fill the expansion tank to the MAX level, but not over that.
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Suggestion
doing the AOS repair only at a later time I'd replace the AOS.
Replace aos even though it shows no signs of distress
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Suggestion
Even if the AOS checks out ok but if it has a lot of miles on it -- say 50K or more -- and if the cost of the AOS replacement is reduced some by doing it when doing other work in that area then as a preemptive action replacing the AOS even though it shows no signs of distress but simply because of its high miles, propensity for failing, and to save some money vs.
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Suggestion · Original poster
I also broke a coolant line about a month ago while replacing my engine mounts, is it possible that I may have some air trapped in the coolant system somewhere?
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22 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Hey guys,
I took the Porsche out for a spin tonight, and when I parked it had steam coming from the driver's side engine compartment. Appears the the coolant reservoir cap is leaking and dumping a bunch of coolant out.
I just bought the car a few months ago, and the previous owner told me he had a new reservoir (and I assume cap) put in. Is it possible that a coolant reservoir cap that's less than a year old could have failed already? The attached photo is what my cap looks like, seems like the latest model.
I also broke a coolant line about a month ago while replacing my engine mounts, is it possible that I may have some air trapped in the coolant system somewhere? Am I in jeopardy of damaging the engine at all?
I just ordered a new cap, so I'll try that as a first step to diagnose.
Thanks for the input!
Chris
It is also possible that the coolant may have been overfilled and the release valve with the green arrow could have lifted from pressure to relieve the system. Are you sure that the fluid was coming from the cap and not the relief valve? You say you broke a line and asked could it have air in the system. Lift the valve (green arrow) and run the car as normal and the air (should there be any in the system) will find it's way to the relieve valve. Keep an eye on the engine temperature and don't hammer the revs too high when you are doing this procedure. Good luck. This s good check page to see if you have the appropriate cap for the car
http://www.pelicanparts.com/support/OEM_FAQ.htm
Now that you mention it, I did add some distiller water last weekend while I was changing my tail light and haven't driven it since, maybe I overfilled it. It looked like it was coming from the cap and pouring out of the drainage hole (red arrow), but could have been coming from the pressure relief valve behind the cap (it was dark). Should I also suck some water out to the min mark? Haven't checked it yet this morning, hopefully haven't lost too much.
Can the pressure valve get stuck open? If it was the valve, I would expect just one session of pressure relief and then be fine after?
Coolant level is a little above minimum this morning, tried removing the cap but it appears I may have put it on a bit too tight last night. Will try again after work today.
Fill the expansion tank to the MAX level, but not over that. There needs to be a little air in there for expansion. Why would you want it at the MIN level? The relief valve should not be leaking. It is down when cold, and up when the engine is at operating temperature. You can check this first thing in the morning, it should be down. Then drive and when warmed up, the relief valve should be up. If you suspect air in the system, you can use the little wire thing to "prop" up the relief valve to bleed air from the system. Run it like that for a few days and that should "burp" any air from the system. My cap gets stuck as well, just wrap in a rag and put a channel lock on it...gently turn.
That blue cap is correct, part #996-106-447-04-M100 which you can find in our catalog
here
.
Also, take a look at our coolant flush article which may provide more detail on this topic especially 3/4 of the way into the content:
Porsche 911 Carrera Coolant Flush
Fire over any questions - Mark/Pelican Parts
Just picked up a blue one from my local Porsche dealer, it's blue and part number ends in 04. I thought the black one was Porsche because in the picture on Automobile Atlanta it was black and said OEM or Porsche genuine. Took it up to temp and everything appears normal, thanks guys!
"Max" is for when the engine is hot. "Min" is for when the engine is cold. If you fill to "Max" when it is cold it will vent some due to expansion when hot.
Looks like I spoke too soon, after a drive tonight came out to my car to find a small puddle underneath the left rear and my coolant level is low. I can't see where the leak is from the rear of the engine, but I can see it dripping from the location in the picture (pic from behind driver's side rear wheel.) Not sure squarish thing is, but is that something that would leak coolant? My guess is that in replacing the reservoir cap, I upset the delicate balance that was my cooling system, maybe by sealing the cap the higher pressure has caused a hose to leak?
The square thing is an engine heat shield. Just above this are some coolant lines that run to the Air Oil Separator, and the Air Oil Separator (AOS) itself. Probably one of the connectors, lines or the AOS itself that is leaking there. The AOS is plastic and ages badly. You will need to get the car up, have a very bright flashlight and a mirror tool to figure out what is leaking.
If the AOS coolant lines/fittings are leaking yes it i worth replacing the AOS while you are there. I'd say it is imperative the AOS be replaced given the slightest sign of any problems.
Even if the AOS checks out ok but if it has a lot of miles on it -- say 50K or more -- and if the cost of the AOS replacement is reduced some by doing it when doing other work in that area then as a preemptive action replacing the AOS even though it shows no signs of distress but simply because of its high miles, propensity for failing, and to save some money vs. doing the AOS repair only at a later time I'd replace the AOS.
Car has 80k miles on it, and didn't come with any work history. Was able to get a hold of the two previous owners who owned it since 60k miles, confirmed nothing has been done to the car since 60k except for coolant reservoir replacement. I'm also guessing the person who sold it at 60k didn't do anything right before they sold it, so it could have missed it's 60k tune up. Anything else I should have done while I'm in there? Spark plugs, belts, etc? I had a PPI performed prior to buying the car 5 months ago, didn't indicate anything mechanically wrong with the car.
I have a black cap.
Looking at the service history, two years ago the PO replaced the expansion tank. I bet the cap came with the tank, leading me to believe that either both the tank and cap are OEM or neither are.
Since my cooling system is working ok I am not changing a thing. I will think about that black cap and if it cracks open at the same pressure as the blue cap. And then I will do nothing.
I looked at Pelican Parts. They sell an expansion tank that is "German" as opposed to "OEM" or "Porsche" branded.
The expansion tank and cap are sold separately. The cap we offer is
Genuine Porsche
while we offer both the
German
(that's a brand name) and
Genuine Porsche
expansion tanks.
Click here for further info about these parts.
Mark/Pelican Parts
This is a source reference. Confirm exact model applicability in the original material.
