Jump to content

Coolant Reservoir Venting


gsd112

Recommended Posts

  • Donating Members
  • Member For: 13y 6m 23d
  • Gender: Male
  • Location: Penrith

Hi Guys,

Hopefully someone can help me?

I had a coolant flush last Monday and I supplied a new coolant reservoir and cap (repco). All went well till Thursday when I got to work 50km drive it vented the whole tank on the ground. This is the first time I had run the car without the a/c on since the flush. I let it sit all day and I topped it up to half way between Min cold and Max cold marks. I drove around 25kms with a/c on and stopped and it was just below the hot max mark and stayed there. The rest of the way back to the mechanics I turned off the a/c and when I got to the mechanic it vented again. So the mechanic said it was the cap due to the radiator hose being soft and the system wasn't holding pressure.

So I changed the cap with a genuine one and took it to work today and it did it again with a/c off.

Any ideas what might be causing this? The temperature hasn't changed, its not going over half even if giving it a hard time.

Link to comment
Share on other sites

  • Donating Members
  • Member For: 13y 6m 23d
  • Gender: Male
  • Location: Penrith

All this has been done. I don't know where to go from here. I don't know if I should go back to the original guy and say fix it or just cut my loses and go to a forum sponsor who normally services it but I thought the local guy cant mess a coolant change up. Any idea why its only when the A/C is off?

Link to comment
Share on other sites

  • Donating Members
  • Member For: 13y 6m 23d
  • Gender: Male
  • Location: Penrith

I have no pressure in the system. I can take off my reservoir cap after a 30min drive without any issues what is going on?

Link to comment
Share on other sites

  • Donating Members
  • Member For: 16y 4m 7d
  • Gender: Male
  • Location: Melbourne

Shouldnt you also do it with the heater on as well?

Coolant is always flowing through the hearter core, the temp control knob/button just controls a little door inside the climate control

Blending hot and cold air to get the set temperature

Old cars had heater taps, anything with climate control has a blending door

Link to comment
Share on other sites

  • 2 years later...
  • New Member
  • Member For: 5y 7m 17d

I have no pressure in my cooling system at normal running temperature. Once switched off it starts boiling in the top radiator hose and build’s pressure up till boiling stops but don’t lose coolant. Any one know what’s happening?

Link to comment
Share on other sites

  • less WHY; more WOT
  • Site Developer
  • Member For: 15y 11m 18d
  • Gender: Male
  • Location: Melbourne

Thermosiphon, is likely what is occurring with that boiling.

 

you'll definitely have pressure in the system at normal running of the engine, or you'd most certainly have a leak. Have you tried "gradually" loosening the radiator cap (very slowly), while it's running, to see if it has pressure?

 

:Welcome2FordXR6t:

Link to comment
Share on other sites

  • Puff
  • Gold Donating Members
  • Member For: 9y 1m 27d
  • Gender: Male
  • Location: South Australia
14 minutes ago, k31th said:

Have you tried "gradually" loosening the radiator cap (very slowly), while it's running, to see if it has pressure?

 

Squeeze the top hose :)

Link to comment
Share on other sites

  • 3 years later...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    • No registered users viewing this page.
×
  • Create New...
'