water noise !!!

[tony g]

i fitted a new thermostat just before xmas, bled the system and every thing seems fine, all hoses getting hot, heater working ok, no loss of water, but when im parked and i raze the rev's to about 2000 rpm i can here water gushing round the heater matrix ? (its a 1.8 by the way). am i just getting paranoid ?

[chrissyboy]

Originally Posted by tony g

i fitted a new thermostat just before xmas, bled the system and every thing seems fine, all hoses getting hot, heater working ok, no loss of water, but when im parked and i raze the rev's to about 2000 rpm i can here water gushing round the heater matrix ? (its a 1.8 by the way). am i just getting paranoid ?

you still got an air lock in the system ,it is hard to bled the system fully but you have to make sure you have no air at all in it ...

[tony g]

Originally Posted by chrissyboy

you still got an air lock in the system ,it is hard to bled the system fully but you have to make sure you have no air at all in it ...

thats what i was thinking, but no matter how many times i bled it i dont get any air out !!!! thank god my bikes got an air cooled engine

[HarryM1BYT]

You might need to create some sort of vacuum in the header tank, to get the air bubbles to expand and flow out. Not sure how you would achieve that, but I had an idea to try an aqua-vac nozzle sealed onto the filler.

[chrissyboy]

only way to do it is to keep bleeding ,when i got mine i could hear the water gurgl ,not knowing about the 75 then i thought it was normal ,,2 weekslater the ytop hose burst .. i had it bleed in so called rover specalists and then the bottom hose went lol.. so i decided to let my guys do it with me we bleed it this way ,run the car make sure loads of coolant is in the header take then put hearter on full then bleed ,top up bleed again, top up bleed again ,when the coolant has a steady flow coming from the bleed valve lock it up turn off heater then bleed again this time just a quick bleed ,then replace cap wait to see when fan comes on and keep an eye the temp gauge .. if fan comes on and the gauge is just sitting at 9 o/clock take the car for a spin to put it under load .make sure that all pipes are hot and can squeeze then about half inch.by the way when bleedig check all hoses are hot before taking car for drive is not bleed again .. make sure that the smaller ones to the matrix are hot too,,takes time ut your get there in the end .. sometimes i blow in the header tank long and hard ..

[tony g]

Originally Posted by chrissyboy

only way to do it is to keep bleeding ,when i got mine i could hear the water gurgl ,not knowing about the 75 then i thought it was normal ,,2 weekslater the ytop hose burst .. i had it bleed in so called rover specalists and then the bottom hose went lol.. so i decided to let my guys do it with me we bleed it this way ,run the car make sure loads of coolant is in the header take then put hearter on full then bleed ,top up bleed again, top up bleed again ,when the coolant has a steady flow coming from the bleed valve lock it up turn off heater then bleed again this time just a quick bleed ,then replace cap wait to see when fan comes on and keep an eye the temp gauge .. if fan comes on and the gauge is just sitting at 9 o/clock take the car for a spin to put it under load .make sure that all pipes are hot and can squeeze then about half inch.by the way when bleedig check all hoses are hot before taking car for drive is not bleed again .. make sure that the smaller ones to the matrix are hot too,,takes time ut your get there in the end .. sometimes i blow in the header tank long and hard ..

i'll keep at it Chris, the last time i did it 18 months ago it bled up no prob !!!! go figure ?

[Phil]

I did a how too on something irellivant to this topic but tagged onto the end was a simple way to do a vac fill, admittedly on a V6 but should make no difference, if you have a vac pump it would help.

[geofftl1000r]

When bleeding the system, does it matter if the heater is on hot? Is there a valve that controls the flow of water to the matrix, like the old Mini?

[tony g]

Originally Posted by Phil

I did a how too on something irellivant to this topic but tagged onto the end was a simple way to do a vac fill, admittedly on a V6 but should make no difference, if you have a vac pump it would help.

i wish i had a vac pump Phil but working in a lawnmower shop we have no need for one !!!!!!

[HarryM1BYT]

Originally Posted by geofftl1000r

When bleeding the system, does it matter if the heater is on hot? Is there a valve that controls the flow of water to the matrix, like the old Mini?

No, water flow through whether it is set to heat or cool. The difference is only a flap which directs the air, through the heating or cooling matrix. It is probably just an hangover from when you had to turn the heat on and off with a brass valve on the head - the valves which always used to seize solid

There was a trick of only filling the header tank with the car on as steep an uphill slope as you could find, to avoid airlocks - which worked on my last car. I wonder if that might help with the 75?