Omega Owners Forum

Please login or register.

Login with username, password and session length
Advanced search  

News:

Please check the Forum Guidelines at the top of the Newbie section

Pages: [1]   Go Down

Author Topic: HBV failing - early warning  (Read 1315 times)

0 Members and 1 Guest are viewing this topic.

cdx25

  • Junior Member
  • **
  • Offline Offline
  • Gender: Male
  • Plymouth, UK
  • Posts: 185
    • View Profile
HBV failing - early warning
« on: 23 May 2007, 14:03:01 »
Just thought Id post what may have been an early warning sign that I had on my cdx just before it coughed out all that new antifreeze over the road... >:(

The A/C was recharged as soon as I got the car about 6 weeks ago... and it was great, until about 2 weeks ago when it seemed to lose its ability to cool.  It *was* working, but it wasnt great.  Then it went a bt intermittent - sometimes it would blow cold, sometimes only cool.

Then last night the 'low coolant' warning came on... this morning I discovered a drip drip drip from the back of the engine.  So today, HBV out and changed - which seems to have cured leak and AC back to ice cold.   8-)  

Kevin W posted in another thread about HBVs being implicated in poor AC performance - so I thought I'd add this experience in too.

Cheers

Jon
Logged

STMO123

  • Guest
Re: HBV failing - early warning
« Reply #1 on: 23 May 2007, 14:06:05 »
No doubt Mark can explain exactly why :)
Logged

Kevin Wood

  • Global Moderator
  • *****
  • Offline Offline
  • Gender: Male
  • Alton, Hampshire
  • Posts: 36484
    • Jaguar XE 25t, Westfield
    • View Profile
Re: HBV failing - early warning
« Reply #2 on: 23 May 2007, 14:07:53 »
I suspect part of the failure mode is that it fails to cut off the flow to the heater matrix, meaning the climate can't cut off the heater completely.

Useful information to know.

Kevin
Logged
Tech2 services currently available. See TheBoy's price list: http://theboy.omegaowners.com/

TheBoy

  • Administrator
  • *****
  • Offline Offline
  • Gender: Male
  • Brackley, Northants
  • Posts: 107466
  • I Like Lockdown
    • Whatever Starts
    • View Profile
Re: HBV failing - early warning
« Reply #3 on: 23 May 2007, 15:03:29 »
Quote
I suspect part of the failure mode is that it fails to cut off the flow to the heater matrix, meaning the climate can't cut off the heater completely.

Useful information to know.

Kevin
They fail in different ways, but that would be one of them - ie heating the chilled air, hence only coolish air...
Logged
Grumpy old man

cdx25

  • Junior Member
  • **
  • Offline Offline
  • Gender: Male
  • Plymouth, UK
  • Posts: 185
    • View Profile
Re: HBV failing - early warning
« Reply #4 on: 23 May 2007, 16:08:34 »
Quote
I suspect part of the failure mode is that it fails to cut off the flow to the heater matrix, meaning the climate can't cut off the heater completely.

Useful information to know.

Kevin

Yeah - all sounds very plausible doesnt it.  The inside of the valve was a bit crappy and it may well have been sticking...  presumably it cant stick in the 'no flow' position (as there doesnt seem to be one) and then cause damage by overpressurisation.  But odd that mine then starting piddling out coolant shortly afterwards.  Could be unconnected of course...
Logged
Pages: [1]   Go Up
« previous next »
 

Page created in 0.01 seconds with 17 queries.