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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHWater pressure build up
Leading reported evidence
Run temp
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Unsuccessful attempts
1
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Suggestion · Original poster
Yet the temp never goes above normal running temp.
Leading evidence: 'Run temp' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Run temp' (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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Unsuccessful attempt · Original poster
The temp warning light came on but once I tightened the clip on the pipe and left it overnght the next morning the temp warning light was off but the problem persists
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Unsuccessful attempt · Original poster
The temp warning light came on but once I tightened the clip on the pipe and left it overnght the next morning the temp warning light was off but the problem persists
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911uk: 1 discussions
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The water pressure iseems to be getting high causing the pipe at the bottom of the expansion tank to spew water out, the water is airated/ foamy. Yet the temp never goes above normal running temp. The temp warning light came on but once I tightened the clip on the pipe and left it overnght the next morning the temp warning light was off but the problem persists
Any thoughts?
Pressure building up in the cooling system could be a couple of simple things and a couple of bad things.
Normally if pressure builds up for some reason the coolant would come out via the pressure release valve on the top of the header tank. (its a round black unit with a wire clip in top) . This might be faulty forcing fluid out of the next weakest area ; in your case the lower hose.
You may have a crack around the base of the tank or at the pipe union, or a faulty hose.
The header tank caps are also famous for failing and a modified one was introduced I think for the face lift cars and can be bought from any OPC.(you dont say which model you have...if its a turbo then someone else will help)
So one of those may be the problem.
However in normal circumstances whilst the coolant system is pressurised it is not excessive and would not normally lose water in any serious amount.
The bad bit is that a pressurised coolant system is a symptom of cylinder head failure (they are prone to cracking) and /or a cracked cylider liner.
Check for any sign of oil in the water or water in the oil. Although this is not always present. The fact that you say its frothy would tend to indicate that it is being airiated in some way.
If its not one of the simple things get it to a good indie or more particularly Hartech or Autofarm who specialise in these faults and can offer cost effective solutions.
Hope its one of the simple things.
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