No coolant flow after new WP install
#1
No coolant flow after new WP install
Hi,
'87 S4 Auto Euro
I have just put the front of the engine back together after replacing the water pump, TStat, belts and dist caps/rotors.
I filled the rad through the bottom hose, reconnected the hose and topped up at the coolant reservoir.
It took only 8 litres of coolant.(It was fully drained from the rad plug and 2 plugs under the engine.
With the internal heater blower on full I started the car.
It runs for 10mins then the temp gauge goes into the red.
The internal blower is blowing cool air and the hose connecting to the bottom of the rad is cool.
Could this be air in the WP or a stuck thermostat or something more?
The car is on an approx 2% incline should this effect its ability to self- bleed?
Any ideas on how to move forward?
Many thanks,
Wavey.
'87 S4 Auto Euro
I have just put the front of the engine back together after replacing the water pump, TStat, belts and dist caps/rotors.
I filled the rad through the bottom hose, reconnected the hose and topped up at the coolant reservoir.
It took only 8 litres of coolant.(It was fully drained from the rad plug and 2 plugs under the engine.
With the internal heater blower on full I started the car.
It runs for 10mins then the temp gauge goes into the red.
The internal blower is blowing cool air and the hose connecting to the bottom of the rad is cool.
Could this be air in the WP or a stuck thermostat or something more?
The car is on an approx 2% incline should this effect its ability to self- bleed?
Any ideas on how to move forward?
Many thanks,
Wavey.
#2
Thermostat
Did you replace the thermostat also? Sounds like you have air trapped.
You could try to run the engine again keeping the reservoir cap off to see if any air can come out. Or remove the temperature switch and see if you get a consistent flow of antifreeze coming out
You could try to run the engine again keeping the reservoir cap off to see if any air can come out. Or remove the temperature switch and see if you get a consistent flow of antifreeze coming out
#4
Rennlist Member
If you squeeze the hoses, do you hear water or get bubbling in the reservoir? I always fill mine from the reservoir tank (maybe 5 or six times now) and have never had any problem. But yes it sounds like there isn't any water in the water bridge thus not heating the thermostat. Could try loosening the temp II sensor and seeing if you get air.
#5
Rennlist Member
The system takes approx 14 litres of coolant after a TB/WP job as I recall so something seemingly not right. I always fill through the expansion tank and like to remove the radiator vent line until I know it is flooded.
Even so no idea why you have the result you have- I doubt a slight incline should cause any grief.
Even so no idea why you have the result you have- I doubt a slight incline should cause any grief.
#6
Rennlist Member
I have the cap of the expansion tank, fill the system and always "pump" both front radiator hoses with my hands, burps the system well from air. Keep topping up in the expansion tank until it stays at half full. Then start the engine for a short while with the cap off and let the residual air escape. With the cap on, you should then be good to go. If your thermostat and other things are good that is...
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CliffH (10-15-2023)
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#8
Drifting
To get my GT to finally bleed, I jacked the front of the car up, removed the radiator cap, started the car and just let it idle while squeezing the radiator hoses every now and then. It self-bled with no problems afterwards.
#9
Ended up topping up the water bridge through the Temp sender port and running on an off for an hour or so.
Finally got the air out and she is perfect now.
Had a terrible feeling that the newly installed WP impeller was not turning somehow!
Back on the road after a month.
Finally got the air out and she is perfect now.
Had a terrible feeling that the newly installed WP impeller was not turning somehow!
Back on the road after a month.
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Geo55 (10-15-2023)
#10
Rennlist Member
This: ... UView 550000 Airlift suction refill kit. It uses a shop-air venturi pump to suck most of the air out of the cooling system, close a valve and watch for a stable vacuum, then switch hoses to a 5-gal bucket with about 15L (4 gal) mixed coolant and open the valve. It sucks the bucket dry in about 30 seconds, done.
Goats are probably cheaper, however.
Goats are probably cheaper, however.
Last edited by jcorenman; 10-15-2023 at 10:26 PM. Reason: Fix messed-up URL
#11
RL Community Team
Rennlist Member
Rennlist Member
This: Airlift refill kit ... UView 550000 Airlift suction refill kit. It uses a shop-air venturi pump to suck most of the air out of the cooling system, close a valve and watch for a stable vacuum, then switch hoses to a 5-gal bucket with about 15L (4 gal) mixed coolant and open the valve. It sucks the bucket dry in about 30 seconds, done.
Goats are probably cheaper, however.
Goats are probably cheaper, however.
#12
Drifting
Loosen the top rad hose, swing it up, and fill the system with coolant from there as well as the expansion tank
You will get 15 L total in, and there's no need to bleed anything
You will get 15 L total in, and there's no need to bleed anything
#13
Rennlist Member
This: Airlift refill kit ... UView 550000 Airlift suction refill kit. It uses a shop-air venturi pump to suck most of the air out of the cooling system, close a valve and watch for a stable vacuum, then switch hoses to a 5-gal bucket with about 15L (4 gal) mixed coolant and open the valve. It sucks the bucket dry in about 30 seconds, done.
Goats are probably cheaper, however.
Goats are probably cheaper, however.
After that It would not hold vacuum. Tried to get it ait tight and in the process broke the brass fitting.
I reached out to them get it looked and they wanted almost as much as paid for it to fix it.