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        General >> Problems >> Bleed cooling system - DOHC 2.0 Scorpio
        
(Message started by: meeko on Jan 28^th, 2007, 5:40pm)

Title: Bleed cooling system - DOHC 2.0 Scorpio
Post by meeko on Jan 28^th, 2007, 5:40pm

Hi all,

I have a 1994 2.0 DOHC Scorpio. There is air in the coolant system which prevents the heater matrix from heating up very much.

Does anyone know the procedure for bleeding? There is a tyre type valve on the top hose entering the matrix, but not sure of the sequence to bleed.

Thanks all - it's cold now and would love a decent heater!

Title: Re: Bleed cooling system - DOHC 2.0 Scorpio
Post by jonnycab on Jan 28^th, 2007, 5:45pm

If it's an airlock then I use the following procedure. It works a treat :-
1) Pull off the small hose that goes to the expansion tank from the large top pipe.
2) Shove a transparent pipe approx 2 feet in length into it & attach it to the underside of the bonnet as high as it will go (air rises to the highest point) with gaffa tape.
3) Start the car & sit in drivers seat revving engine. When the engine warms up you will see any air bubbles in the cooling system expelled through the transparent pipe.
4) When no more air can be seen bubbling up, then the system should be air free.
Takes about 20 minutes

Hope this helps :)

Title: Re: Bleed cooling system - DOHC 2.0 Scorpio
Post by meeko on Jan 29^th, 2007, 7:37pm

Thanks for the tip! I presume this will work on the older non-frog eye Scorpio as I see you have a nice new shape one!

Title: Re: Bleed cooling system - DOHC 2.0 Scorpio
Post by jonnycab on Jan 30^th, 2007, 12:50am

It should work on any car as long as there is a return pipe on the expansion tank :)

All the tube does is create the highest point in the cooling system - hence any trapped air should come out here.

Usually the expansion tank is the highest point, & running the engine with the pressure cap removed should let any air out. But I have found the tube method to be alot more effective.

The reason for the tube being transparent is so you can literally see the air coming out. Usually the coolant will rise up the tube first, followed by an air pocket or bubbles, which is then dispersed as the liquid drops back down ;)

..........Sorry if I'm waffling ;)