11 replies to this topic

[phillrulz]

Hi all, did a coolant flush and replacement yesterday, notices that on idle there is no flow from the heater valve, however if you rev it flows perfectly fine. 

 

When i say no flow i mean with the heater hose off the valve NOTHING comes out, however rev the engine from the carb and it flows likea goodun. 

 

 

IS it a sign of my water pump on the way out?? 

 

Also noticed i had what looked like copper antisieze in the coolant. i have been suffering with running a little warm recently so just ordered a new pump and will be getting a new 2 core for the supercharge upgrade im having soon. 

 

[unburntfuelinthemorning]

Sounds to me more like air in the system.  A water pump on its way out normally manifests itself as a leak from underneath the pump.

[phillrulz]

Sounds to me more like air in the system.  A water pump on its way out normally manifests itself as a leak from underneath the pump.

 

 

Think the weep hole is dry, ahwell ive never changed the pump so ill do it anyway 

[cal844]

It does sound like air in the system.

To get the air out I open the heater valve with the engine running and radiator cap off. I also fill the radiator to the bottom of the filler neck.

I let the engine warm up and once it's off the choke lift the idle to 2000 rpm until the air is out.

You may need to squeeze the heater pipe that goes to the heater to force the air out

[cal844]

It does sound like air in the system.

To get the air out I open the heater valve with the engine running and radiator cap off. I also fill the radiator to the bottom of the filler neck.

I let the engine warm up and once it's off the choke lift the idle to 2000 rpm until the air is out.

You may need to squeeze the heater pipe that goes to the heater to force the air out

[phillrulz]

It does sound like air in the system.

To get the air out I open the heater valve with the engine running and radiator cap off. I also fill the radiator to the bottom of the filler neck.

I let the engine warm up and once it's off the choke lift the idle to 2000 rpm until the air is out.

You may need to squeeze the heater pipe that goes to the heater to force the air out

 

so your saying just fast idle it with the rad cap off, and the air should just come back through the thermostat. 

 

Will have a go once i get my new rad  and pump in 

 

Edit- fast idle isnt the best word i could have used, just have your foot on the throttle 

Edited by phillrulz, 16 June 2019 - 11:23 AM.

[imack]

Years ago I had a water pump where the impeller became loose on the shaft when hot. Pumped water out of the heater valve from cold but no flow when hot as the impeller expanded and became loose in the shaft.
I'd have to start by replacing the pump and retesting.

[cal844]

Years ago I had a water pump where the impeller became loose on the shaft when hot. Pumped water out of the heater valve from cold but no flow when hot as the impeller expanded and became loose in the shaft.
I'd have to start by replacing the pump and retesting.

Ford Focus engines are bad for this

[cal844]

It does sound like air in the system.

To get the air out I open the heater valve with the engine running and radiator cap off. I also fill the radiator to the bottom of the filler neck.

I let the engine warm up and once it's off the choke lift the idle to 2000 rpm until the air is out.

You may need to squeeze the heater pipe that goes to the heater to force the air out

so your saying just fast idle it with the rad cap off, and the air should just come back through the thermostat.

Will have a go once i get my new rad and pump in

Edit- fast idle isnt the best word i could have used, just have your foot on the throttle

You can also use the idle adjustment screw on the carb to raise the idle

[viz139]

I had an old 850 that ran fine but heater didn't work.Dissconnected hose but no flow even when full of water. Most of the water pump impeller had corroded away, don't know how it cooled the engine at all. Lucky it was an 850.

[phillrulz]

I had an old 850 that ran fine but heater didn't work.Dissconnected hose but no flow even when full of water. Most of the water pump impeller had corroded away, don't know how it cooled the engine at all. Lucky it was an 850.

 

 

Thats what making me think impeller, ive never changed it and had it 3 years, plus she does run a little warm 

[phillrulz]

Just had the pump out, looks pretty good, however still upgrading / replacing with the minispare high flow "super pump" im a fan of dont fix what isnt broken but id rather have more flow for when shes got a blower.