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[OpelJay]

Hi guys i have a CD 2.0 on a W plate

sometimes when i get in the car with the wife we will notice that the heating is blowing cold sometimes, no change even up to a hour! although the engine heat is normal and it all works ok? sometimes after 30 mins it may decides to realise the heat then it all works ok? or sometimes it will just heat up as normal. i find most the time i get in the car go for a normal drive for 30 mins its cold, then go shopping for 20 mins get back in the car and heat comes though straight away? seems strange?? ive tried goin on google but non of what they say on there are the same only thing that sounded the same was something to do with the HBV valve?? and i dont believe my head gasket has gone there's no signs of that all pipes are hot and changed the thermostat and dont get loss of water

Hope you guys can help me 

[freecall666]

have you flushed out rad systerm, if not do full flush out and back flush, make sure water comes out clean. if dose not take off intera rad pipes and flush out back and foeward that rad until clear. if still not clean, boil kettle and put kettle cleaner in and poor into rad and when water comes out other pipe plug bottom pipe up and leave for hour or so then flush again, if works put back together and refill

[OpelJay]

Yer Ill put some rad flush in see how that goes 

[fiend61]

is your car mfl or f/l ?

there could be numerous reasons why this is happening 
1- is your ext temp sensor working correctly?
2- hbv sticking
3- vacuum pipes not working correctly
4- int temp sensor not working correctly
5- sampling fan blocked (as mine was )
6- pipes and/or rad semi blocked

[OpelJay]

mfl / f/l? whats that
yer the ext temp senser working fine
not sure about the HBV or its pipes yet?
fan ant blocked checked and cleared that
felt pipes and checked its all working and getting up to temp thats ok.
just seems strange how its so random like no real patten to it like today started her up and bam heat sraight away?
its baffling me i tell ya but think i might have a look at that HBV think its under the wipers a it?
are they all in the same place on all models?