This is a final cry for help as the car is booked in for Thursday but would ideally like to sort it before then!
Been having a lot of trouble with my coolant. Initially the guage was cycling between 75ish and 90 with air temp from blowers fluctuating as though the thermostat had gone. I ordered a new thermostat from Seat and replaced it. I bled the car as normal and experienced a little issue with overheating but re-bled and sorted it.
After this I could run the car up to temperature when static but as soon as I started moving the car would cool right down to 60 on the gauge. I went back to Seat to get the thermostat replaced for nothing as I believed it was U/S on fit but they managed to convince me I had another problem somewhere and that thermostats were very reliable so there was no need to look at it again. They said it was either a blocked rad or an air lock somewhere. After bleeding the car over and over and hours of general farting round I decided that it was worth a look at the t'stat. This is what I found
I put the old t'stat back in and experienced similar problems to when the replacement t'stat was fitted but not the original fault that caused me to initially change the t'stat. (if that makes sense)
It would get up to temp while it was static but above roughly 40ish mph would cool to the mark above 60'. If I hammered it through 2nd and 3rd gear it would warm up very slightly but cool off as soon as I backed off to a constant speed which it didn't do originally. There was no cycling of the temp at all this time
Since then I've checked the rad isn't blocked, if I take off the top hose and pour coolant down that then the increased fluid volume through the system forces coolant out the top of the rad, i've checked that fluid is flowing when its running by briefly opening the lower drain and got slightly wet for my troubles
What am I missing? The fact that the fault is different when an identical (although possibly faulty) t'stat was fitted is confusing me, surely if it was that causing the problem then the fault should have reverted back to the original temp cycling issue, not change to a third slightly similar fault?
Anyway should I just look at chaging the t'stat again or am I looking at a water pump or is there something really obvious I missed?
Been having a lot of trouble with my coolant. Initially the guage was cycling between 75ish and 90 with air temp from blowers fluctuating as though the thermostat had gone. I ordered a new thermostat from Seat and replaced it. I bled the car as normal and experienced a little issue with overheating but re-bled and sorted it.
After this I could run the car up to temperature when static but as soon as I started moving the car would cool right down to 60 on the gauge. I went back to Seat to get the thermostat replaced for nothing as I believed it was U/S on fit but they managed to convince me I had another problem somewhere and that thermostats were very reliable so there was no need to look at it again. They said it was either a blocked rad or an air lock somewhere. After bleeding the car over and over and hours of general farting round I decided that it was worth a look at the t'stat. This is what I found
I put the old t'stat back in and experienced similar problems to when the replacement t'stat was fitted but not the original fault that caused me to initially change the t'stat. (if that makes sense)
It would get up to temp while it was static but above roughly 40ish mph would cool to the mark above 60'. If I hammered it through 2nd and 3rd gear it would warm up very slightly but cool off as soon as I backed off to a constant speed which it didn't do originally. There was no cycling of the temp at all this time
Since then I've checked the rad isn't blocked, if I take off the top hose and pour coolant down that then the increased fluid volume through the system forces coolant out the top of the rad, i've checked that fluid is flowing when its running by briefly opening the lower drain and got slightly wet for my troubles
What am I missing? The fact that the fault is different when an identical (although possibly faulty) t'stat was fitted is confusing me, surely if it was that causing the problem then the fault should have reverted back to the original temp cycling issue, not change to a third slightly similar fault?
Anyway should I just look at chaging the t'stat again or am I looking at a water pump or is there something really obvious I missed?
