Hi dan.
The temp reading always corresponds to what I am feeling coming from the heater. Hot at idle and cool when moving.
Yorkie.
Any Mechanics on the Forum? Problem with wifes car.
- Thread starter Yorkie
- Start date
Hi dan.
The temp reading always corresponds to what I am feeling coming from the heater. Hot at idle and cool when moving.
Yorkie.
Hi EF.
Never had to put a drop of water in it since I got it. Pretty sure no leaks present. Gasket seems fine.
Yorkie.
What are you using for coolant? and when was the last time you had the system flushed out?~Muir
Hi Andy.
anti-freeze and water mix. Coolant was all changed when thermostat was changed. We have coolant a very nice shade of pink now
. Not sure if it was actually flushed under pressure but it is all new coolant and the old coolant was clean.Thanks.
Yorkie.
As said check the electrical connectors /leads.
It's an information highway world now, one of your lanes (electrical) has a plastic bobby holding things up!!! check all your leads are contacting properly.
check all your leads are contacting properly.I'm not sure how it could be electrical. The heater output appears to match the temp reading, so it doesn't sound like a fault in the temp reading or in the heater fan. The cooling fan (assuming it's electric) shouldn't be running at motorway speeds anyway, so a failure there would act up at the opposite time.
Water pump or gasket issues would be showing additional symptoms.
That really sounds like a stuck-open thermostat. It's possible the replacement was duff out of the box....
(Caveat: while I maintain several classic cars, I'm not a professional mechanic.)
Cheers,
Jeff.
Water pump or gasket issues would be showing additional symptoms.
That really sounds like a stuck-open thermostat. It's possible the replacement was duff out of the box....
(Caveat: while I maintain several classic cars, I'm not a professional mechanic.)
Cheers,
Jeff.
Hi jeff.
The cooling fan is not running at motorway speed. It only kicks in as you would expect when the car is stood and ticking over and the temp goes up.
As soon as you move and get airflow over rad then temp drops to 60 degrees. As you say the symptoms scream ' thermostat stuck open'. That is why I put a genuine part on so I would not be doubting some Chinese after market one from e bay.
I checked coolant this morning and it has not lost a drop.
Its driving me mad.
Yorkie.
It's an information highway world now, one of your lanes (electrical) has a plastic bobby holding things up!!!
Hi FB.
I am a dummy with electrics but I will wiggle things about.
In theory though an electrical fault should throw up a fault code and there non.
Thanks
Yorkie.
While not getting to the reason for the problem, a trick from the old days was to partially block off the air flow to the radiator, use a bit of aluminium foil, start off with a little and increase the area until you get required temp while on the move.
Hi Andy.
anti-freeze and water mix. Coolant was all changed when thermostat was changed. We have coolant a very nice shade of pink now
Thanks.
Yorkie.
Consider a complete coolant system flush. ~Muir
While it won't do any harm, any constriction in the cooling system is much more likely to cause overheating rather than overcooling.
Zafira 2 DTI's are notorious for this, my two have both taken ages to warm up and never run anywhere near the proper temperature. I changed numerous thermostats and no change. You can always check the thermostatby placing in a pan of cold water and bringing up to the boil and then cooling to see if it opens and closes ok. You could try replacing the temp sender as it might be faulty, did that with mind and went totally hay wire so if you do keep the old one and be prepared to swap it on the road side. Best idea is to blank of a portion of the rad with a sheet of something, plastic/ally or alike.
D
D
bewsher500
Well-Known Member
cold when moving, never shows 90deg
heats up when still, fan kicks in at right temp
with those symptoms it can only be a faulty thermostat
it is stuck open meaning the still warming coolant is flowing through the radiator and cooling down when on the move
Not the end of the world but long term not a great idea as the ECU uses coolant temp in delivering the fuel mix
you do not want to run it cool for any length of time IMO
bodging the radiator is a poor way of fixing an otherwise simple problem
who did the stat job and what parts did they use?
heats up when still, fan kicks in at right temp
with those symptoms it can only be a faulty thermostat
it is stuck open meaning the still warming coolant is flowing through the radiator and cooling down when on the move
Not the end of the world but long term not a great idea as the ECU uses coolant temp in delivering the fuel mix
you do not want to run it cool for any length of time IMO
bodging the radiator is a poor way of fixing an otherwise simple problem
who did the stat job and what parts did they use?
Hi Cyres.
I see what you mean about putting it in hot water and blanking the rad but I am hoping for a proper fix. The thermostat has electrics running to it and I am not sure what they do. when I was a lad they were very simple things.
Thanks.
Yorkie.
Hi Bewsh.
I agree that logic points to the thermostat. The car is being over cooled when moving.
My local Garage did it who I trust and he used a genuine Vauxhall 'stat.
You are correct, it needs sorting as running cool has knock on effects.
Thanks.
Yorkie.
dave 67
Well-Known Member
Not up to speed with Vauxhalls but had an issue with my BM just not getting to temp turns out there are 2 thermostats main one and one on the egr valve.
Also if your car has electrics that plug in to the thermostat it could have a thermostat that is also electrically controlled,if the car starts to think you are accelerating very hard it prempts the rise in temp sending an electric current through the thermostat opening it earlier so stabilising the temp.
Also if your car has electrics that plug in to the thermostat it could have a thermostat that is also electrically controlled,if the car starts to think you are accelerating very hard it prempts the rise in temp sending an electric current through the thermostat opening it earlier so stabilising the temp.
