Head gasket/Bad water pump/Thermostat??
Discussion
Corsa C 1.8 (Z18XE)
Car has been over-heating recently, usually sits on 90 degrees, dipping to 87/88 when moving at motorway speeds with nice cold air. However it has since been sitting at 94/95 with the heaters on the top setting, and driving at anything more than 6/10 for a minute or so will put it up to around 97 + and it takes ages to come back down.
- There's no leaks, none coming from the weep hole on the water-pump or any hoses/radiator.
- There's no coolant loss at all
It does need a waterpump/timing belt change anyway, so I'll get that done regardless, maybe the fin(s) on the waterpump have worn or broken?
Could it be the thermostat?
I did think my head-gasket could be going, how common is it for a HG failure when the only symptom is over-heating, no oil in coolant/mayo on oil cap and so on?
I guess I should get my local indie to do a compression test, but do you have any suggestions on what I should be trying to eliminate?
Kind regards,
IntriguedUser
Car has been over-heating recently, usually sits on 90 degrees, dipping to 87/88 when moving at motorway speeds with nice cold air. However it has since been sitting at 94/95 with the heaters on the top setting, and driving at anything more than 6/10 for a minute or so will put it up to around 97 + and it takes ages to come back down.
- There's no leaks, none coming from the weep hole on the water-pump or any hoses/radiator.
- There's no coolant loss at all
It does need a waterpump/timing belt change anyway, so I'll get that done regardless, maybe the fin(s) on the waterpump have worn or broken?
Could it be the thermostat?
I did think my head-gasket could be going, how common is it for a HG failure when the only symptom is over-heating, no oil in coolant/mayo on oil cap and so on?
I guess I should get my local indie to do a compression test, but do you have any suggestions on what I should be trying to eliminate?
Kind regards,
IntriguedUser
Just purchased a Circoli thermostat from ECP.
Haven't had it fitted yet, should I just return it? Heard some horror stories from these brands on ECP on other forums. I believe the genuine VX one comes with a coolant temp sensor too, I'll investigate.
The fan does come on at 92 degrees, and goes up a level at 97 ish. I did some research and the coolant isn't circulating through the coolant top up place when the fan is on, which leads me to believe the STAT is stuck in the closed position. Lower radiator hose is also cold.
I'd just like to add that this definitely isn't normal, I've owned two 1.8's and done a combination of nearly 45,000 in both (How an earth I don't know) and I know exactly when something isn't right. I thought water boiled at 100 degrees, what makes the process different in the cooling system?
Haven't had it fitted yet, should I just return it? Heard some horror stories from these brands on ECP on other forums. I believe the genuine VX one comes with a coolant temp sensor too, I'll investigate.
The fan does come on at 92 degrees, and goes up a level at 97 ish. I did some research and the coolant isn't circulating through the coolant top up place when the fan is on, which leads me to believe the STAT is stuck in the closed position. Lower radiator hose is also cold.
I'd just like to add that this definitely isn't normal, I've owned two 1.8's and done a combination of nearly 45,000 in both (How an earth I don't know) and I know exactly when something isn't right. I thought water boiled at 100 degrees, what makes the process different in the cooling system?
Edited by IntriguedUser on Friday 31st July 03:13
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