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Old 28-02-2012   #1
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Temperature above 90

Hey peeps,

Just got to work just want some idea for a quick check during my lunch hour. Basically the temp got higher than usual today and noticed the fan didn't come on. And the fan is blowing out cold here but from time to time there would be a bust of hot air. The car generally doesn't really blow hot air like my other cinq.

I have checked the fuse for the fan and that is fine.

I will check the coolant level during my lunch hour, is there anything i could do as a quick check. (can't really lie under the car :P). Will top it up and bleed it if that has went low, but the it was fine when i checked it 3 days ago.

Also why is my heater temp fluctuating like that ?

Thanks
Ming
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Old 28-02-2012   #2
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Re: Temperature above 90

forgot to add once the car is driving the temp is normal only happens when stuck in traffic.

Ming
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Old 28-02-2012   #3
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Re: Temperature above 90

If it is a Cinq, fluctuating heater like that would either be low coolant you've mentioned or the coolant pump slipping (no coolant flow meaning hot engine but cold heater).
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Old 28-02-2012   #4
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Re: Temperature above 90

Quote Originally Posted by David C View Post
If it is a Cinq, fluctuating heater like that would either be low coolant you've mentioned or the coolant pump slipping (no coolant flow meaning hot engine but cold heater).
No lost of fluids, even went out to bleed it again only did it for 10 mins but there seems to be any air in the system...

Try spinning the fan by hand, it wasn't as freely as I hope. So will do the paper clip test when I am home but will probably change the fan anyway!

Sorry yes, it is a cinq with the 16v engine.

Is it possible for the coolant pump to slip? would that not affect the timing as well?

Thanks
Ming
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Last edited by ycming; 28-02-2012 at 11:54.
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Old 28-02-2012   #5
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Re: Temperature above 90

Quote Originally Posted by ycming View Post
Is it possible for the coolant pump to slip? would that not affect the timing as well?
Depends on the construction of the pump.
What can happen (usually with plastic impellers) is at the point where the impeller connects to its shaft the impeller cracks and that allows the shaft to spin without turning the impeller, which stops the coolant flowing.
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Old 28-02-2012   #6
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Re: Temperature above 90

Quote Originally Posted by David C View Post
Depends on the construction of the pump.
What can happen (usually with plastic impellers) is at the point where the impeller connects to its shaft the impeller cracks and that allows the shaft to spin without turning the impeller, which stops the coolant flowing.
or the plastic impellers have just disintegrated like a vectra i did 2 weeks ago
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Old 28-02-2012   #7
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Re: Temperature above 90

Quote Originally Posted by andys cinq View Post
or the plastic impellers have just disintegrated like a vectra i did 2 weeks ago
Well yes!
But if it gets that far that there will be no coolant flow at all, there is usually a bit of slipping before it gets to that though, but anything can happen...!!
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Old 28-02-2012   #8
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Re: Temperature above 90

Quote Originally Posted by David C View Post
Depends on the construction of the pump.
What can happen (usually with plastic impellers) is at the point where the impeller connects to its shaft the impeller cracks and that allows the shaft to spin without turning the impeller, which stops the coolant flowing.
Thanks for that another thing to check during my lunch break. Hope is not the pump, as that is new since 5000 miles ago!

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Old 28-02-2012   #9
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Re: Temperature above 90

any more idea why the air blowing out is cold?

Also I no longer have a bleeding point for the heater matrix.

I will bleed it again when i am home, jacking the car up a little.

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ming
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Old 28-02-2012   #10
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Re: Temperature above 90

Is the heater blowing cold when the engine is hot?
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Old 28-02-2012   #11
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Re: Temperature above 90

Quote Originally Posted by David C View Post
Is the heater blowing cold when the engine is hot?
Yup ... even when the temp needle is above 90.

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Old 28-02-2012   #12
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Re: Temperature above 90

Quote Originally Posted by ycming View Post
any more idea why the air blowing out is cold?
Can only be:

air in heater matrix

cold water in heater matrix

But the second is pretty much impossible.

Quote Originally Posted by ycming View Post
Also I no longer have a bleeding point for the heater matrix.
Re-instate as a matter of some urgency.
Quote Originally Posted by ycming View Post
I will bleed it again when i am home, jacking the car up a little.
Check water pump (you can peek at the impeller by removing the water rail, and try to spin it).

Check thermostat.

Compression test.
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Old 28-02-2012   #13
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Re: Temperature above 90

thanks for that fingers.

I really don't believe is water pump or thermostat (well i hope lol), water pump is around 5000 miles old and thermostat only 2000 miles..

I noticed after driving home that the heat came back (it wasn't that hot to start with anyway), and that the top hose to the matrix wasn't very hot at all. And i noticed if the car is stationary the temp from the heater would drop and resume to "normal" once driving.

I guess all these do point to a airlock in the system ?

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Old 28-02-2012   #14
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Re: Temperature above 90

Quote Originally Posted by ycming View Post
I guess all these do point to a airlock in the system ?
Or something isn't optimal with the routing of the coolant circuit.
Are there any hoses that are bigger or smaller bore than std?

Is the waterpump pulley the original size for that engine?
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Last edited by David C; 28-02-2012 at 19:43.
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Old 28-02-2012   #15
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Re: Temperature above 90

Classical signs of Head gasket going. Only slight gas loss of cylinder to coolant system, Air locking in the system when coolant flow rate is low but not enough to over pressurise the system to the point of discharge to atmosphere.
Compression test probably won't show this yet as it is so slight. Sniffer test might.
Hope I'm wrong, But........
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Last edited by cc1; 28-02-2012 at 20:37.
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