jderimig

Been a while since I did this. I raised the front, check, heater to warm run fan check.

When the cooling fans start I open the vent, coolant flows out in a stream than stops.. Coolant doesn't flow out again until the temperature rises again near the trip point of the cooling fans.
I have standard thermoswitch (new last year) and new 83C thermostat that I replaced.

Is this normal? It seems years ago when I did this the coolant would flow out of vent all the time if it were bled. But my memory can be foggy.

Dan Martinic

Mine does the same ie. stops flowing at some point. If you're not getting bubbles, and you're making sure the tank is filled, I'd say you're good.

When you close it up and drive around, does the temp look normal and steady, not going past half?

jderimig

It seems to be running hotter than I remember. I have an early 944 and it used to stay a tinch past 1/2 when cruising. Now its a tinch under the 3/4 mark. Fans come on a tinch past 3/4 but turns off a just under 3/4. That is why I started this endeavor with the thermostat change.

I am still adding water to the expansion tank after each bleed cycle so perhaps I don't have all the air out yet. I haven't yet checked my gauges and send per Clarks yet but that will be next if the level in the expansion tank is stable.

Dan Martinic

I was running "a tinch under 3/4" for longer than I care to say; once I bled the system properly, ie. for much longer than I thought necessary, it went back to stopping steady at 1/2 way mark.

Keep bleeding.. but shut the bolt when flow stops, re-opening shortly after. Rev the motor when bolt is cracked open. Repeat until you've got enough of a mess to curse not having a nice way to bleed without spilling coolant all over the place. I'd say 10 mins of noise and coolant mess and you're good.

V2Rocket

Leave the bolt open as you fill the system cold, squeeze the various hoses and you'll see bubbles come out or liquid come out at the vent.

keep filling until liquid comes out without a squeeze, shut vent and run the car till hot and several minutes longer, then carefully crack it open and let steam out, continue until only steady stream of coolant comes out

Dan Martinic

jderimig

Thanks, much better results today.

Noahs944

A thing I do is raise rpms with my hand on the throttle body lever, it seems to bleed better (for me).

400hp944

Once warmed up with the fan running, rev the crap out of it with the bleeder screw open. While water is coming out fairly solid, close the screw. That's what I do with my race car and it runs between 1/4 and 1/2 most of the time.

944crazy

A little trick I do, is to open the vent - squeeze the top rad hose - close vent - let go of hose, repeat until only fluid comes out.