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#278439 - 28th Dec 2008 11:22pm help for air lock
Sanchez Offline

Wiki Veteran

Registered: 17th Dec 2003
Posts: 8019
Loc: my house
does any one know how to get rid of an air lock in the coolant system of a k series engine/from a rover 1.8.

the prob i have is the engine temp guage was dropping to almost zero the blowers went cold, and when i popped the bonnet i noticed the water pipe going to the top of the block was piping hot and under pressure, and the pipe at the bottom (return to rad) was cold

I pumped the hot pipe, clearing the air lock temperally but it didnt fix it, Im also thinking the thermostat (even though brand nw or water pump may of failed.

any help would be appreciated.
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#278458 - 29th Dec 2008 12:04am Re: help for air lock [Re: Sanchez]
BMW Joe Offline
Wiki Master

Registered: 30th Apr 2006
Posts: 12369
Loc: Birkenhead
Try filling it to the brim and leaving it for a bit.

Mine gets an air lock very easy, and you have to fill it as much as you can, leave it for 10 mins, and fill it up again until it stop going down
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#278470 - 29th Dec 2008 12:18am Re: help for air lock [Re: BMW Joe]
Sanchez Offline

Wiki Veteran

Registered: 17th Dec 2003
Posts: 8019
Loc: my house
cheers joe, i'll give it a whirl.
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Uncertainty or not knowing causes depression, Im happy because I know I'm going to die one day!

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#278499 - 29th Dec 2008 8:37am Re: help for air lock [Re: Sanchez]
MrPhil Offline
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Registered: 14th Apr 2006
Posts: 2367
Loc: Prenton
if the problem persists take the stat out, also on the header tank is their a return? if so rev the car and you will notice the coolant move quicker. if so the pumps doing it's job.
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#278518 - 29th Dec 2008 12:02pm Re: help for air lock [Re: MrPhil]
Sanchez Offline

Wiki Veteran

Registered: 17th Dec 2003
Posts: 8019
Loc: my house
Cheers phil.....Should i put the thermostat back in/do what with it, your didnt really explain it that well. also I assume when you say header tank you mean the resevior ?
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Uncertainty or not knowing causes depression, Im happy because I know I'm going to die one day!

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#278610 - 29th Dec 2008 6:00pm Re: help for air lock [Re: Sanchez]
MrPhil Offline
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Registered: 14th Apr 2006
Posts: 2367
Loc: Prenton
yes i mean the resevoir, on some cars (well old renaults) they have a bleed screw on some pipes for air locks, check to see if their is any.

take the car off the header tank (resevoir) and rev the car to around 3k and listen for the water to circulate. If it does then your problem lies with the stat.

When you take the stat out check it in some boiling water. Also was the make QH?
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#278611 - 29th Dec 2008 6:05pm Re: help for air lock [Re: MrPhil]
Sanchez Offline

Wiki Veteran

Registered: 17th Dec 2003
Posts: 8019
Loc: my house
I shall check them things tomoz, do you mean here though


"take the car off the header tank (resevoir) and rev the car to around 3k and listen for the water to circulate. If it does then your problem lies with the stat."

does, or doesnt
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Uncertainty or not knowing causes depression, Im happy because I know I'm going to die one day!

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#278613 - 29th Dec 2008 6:09pm Re: help for air lock [Re: MrPhil]
StuyMac Offline

Wiki Master

Registered: 24th Nov 2003
Posts: 12002
Loc: Wirralshire
Running cold and no hot air could be the stat stuck open, though if it was stuck open it wouldnt pressurise a pipe as water / air can move round the engine. Try running it with blowers on hot, with the rad cap off - squeeze the water pipes and see if any air comes out of the rad.

If you take the stat out, drill a small hole in the housing - this will mean it can automatically bleed when you put it back together.

Is it using water? K series could easily be the head gasket....
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#278614 - 29th Dec 2008 6:15pm Re: help for air lock [Re: StuyMac]
Sanchez Offline

Wiki Veteran

Registered: 17th Dec 2003
Posts: 8019
Loc: my house
cheers chew, just had the head done, so i have to eliminate that straight away.......
_________________________
Uncertainty or not knowing causes depression, Im happy because I know I'm going to die one day!

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#278631 - 29th Dec 2008 7:01pm Re: help for air lock [Re: Sanchez]
StuyMac Offline

Wiki Master

Registered: 24th Nov 2003
Posts: 12002
Loc: Wirralshire
Could still be the head - once they go they can be very tempremental to get working right again if not done properly.

If its just been done take it back to where it was done and let them diagnose it smile
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#278640 - 29th Dec 2008 7:18pm Re: help for air lock [Re: StuyMac]
Sanchez Offline

Wiki Veteran

Registered: 17th Dec 2003
Posts: 8019
Loc: my house
ok laaaaaa, tempted to just smash it in to a wall !

any way, i've bled it abit now, seems to be ok now, fingers crossed.craig from spray force done it, he's done quite a few of them so i can only assume he knows the correct procedure and all the little snaggs when it comes to the k-series.

why didnt they design n air lock free sytem like honda. Knobs
_________________________
Uncertainty or not knowing causes depression, Im happy because I know I'm going to die one day!

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#278680 - 29th Dec 2008 8:51pm Re: help for air lock [Re: Sanchez]
DavidB Offline
Wiki Guide

Registered: 7th Dec 2003
Posts: 5591
Loc: Bebington, Wirral
It's usually the horizontal pipes with bends in that make this hard! I've always cured it by giving each pipe a good minutes worth of squeezing. You'll see all the air come into the expansion tank. I changed my coolant today as well!!

Get a hose and stick it into the pipe from the radiator into the engine and take the pipe on the thermostat off. This is a good start to getting air traps out of the engine. You can also see if the pump is working by the swirly pattern the water comes out at. wink
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#278708 - 29th Dec 2008 10:11pm Re: help for air lock [Re: DavidB]
Sanchez Offline

Wiki Veteran

Registered: 17th Dec 2003
Posts: 8019
Loc: my house
cheers bud, I aint got a clue what your goin on about, but it was useful lol
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Uncertainty or not knowing causes depression, Im happy because I know I'm going to die one day!

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