Re: Vauxhall Omega, over heating

On 31 Aug 2006 09:40:42 -0700, "hitesh" <hitesh_mandalia@xxxxxxxxxxx>
wrote:

Hi, I recently had my N reg 2ltr auto Omega's cooling system flushed
out with a chemical flush and had it refilled with pink anti-freeze. I
noticed there was sand like sludge which came out of the system, even
though I'd flushed it myself about 12 months ago with running water.
As soon as I drove it the temperature hit 100 and I took it back to the
garage. They installed a new water pump and I took it for a spin again.
After about 5 miles the gauge hits 97.5 and is on the verge of going up
to 100 but comes back down again to rest at 97.5. I still think there's
a fault as in the past the gauge never went above 92.5. The fan does
come on at 95.
I am thinking of changing the radiator fan switch and hope it will
resolve the problem.

Anyone got any other suggestions?

The radiator doesn't seem blocked as both the in and out hoses get warm
very quickly and the radiator is even hot. The thermostat is also
working.

The thermostat is set to open at 92 deg, so that's the temperature it
ought to run at.

Question: is there any sign of steam from the exhaust? I ask because
there is a known weak point in the cylinder head which allows a leak
between the water jacket and no. 4 cylinder. Chemical flushing may well
have cleaned out anything stopping this up (and a sand-like sludge hints
at a stop-leak compoung having been used in the past).

The cure is to remove the head, have it skimmed, and reassemble with new
gaskets etc. Not expensive on parts, but labour will mount up I'm
afraid, about 5 hours if nothing else is needed. Of course if your
cambelt is due, you can kill two birds with one stone. DIY only if you
have a good toolkit! (I've done it a couple of times).
--
Regards, Chris (Please take out my car to reply by email)
---1967 Riley Elf----1978 Mini 1000----1965 Hillman Minx---
---1957 Standard 8---1979 Ford Capri---1969 Morris Minor---
---1966 Triumph Herald Estate--1972 Mini Clubman estate ---
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