Author Topic: V6 Coolant bridge - banjobolt/temperature sensor  (Read 1094 times)

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Offline cphill

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V6 Coolant bridge - banjobolt/temperature sensor
« on: March 08, 2021, 00:03:41 AM »
From studying a few postings, an online searching, it looks as though the coolant bridge on the X25E V6 engine fitted to the Calibra and Cavalier is different from the one fitted to the Omega.
The Calibra one has an extra coolant temperature sensor which doubles as one of the banjo bolts holding it the front head, so it has three temperature sensors in all. The Omega one (which seems to be more readily available) has two coolant temperature sensors and each end of the coolant bridge is secured by standard banjo bolts.
Does anyone have the part number for the temperature sensor that doubles as the banjo bolt? Or maybe a kit containing the coolant bridge, one standard banjo bolt and one temperature sensor/banjo bolt.
Despite much online searching I've not found any reference to this temperature sensor/banjo bolt, which looks as though it'll be a difficult part to source.

Offline cphill

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Re: V6 Coolant bridge - banjobolt/temperature sensor
« Reply #1 on: March 10, 2021, 11:12:05 AM »
I noted there was a helpful reply yesterday (9 March) to this posting by me, and I responded with thanks and another question. However, both of thse responses have now disappeared. Question to the moderator - can they be recovered?

Offline cphill

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Re: V6 Coolant bridge - banjobolt/temperature sensor
« Reply #2 on: March 10, 2021, 11:15:04 AM »
Apologies! The posting and reply was on the Cavalier Owners Club site - not this one.  I've tried both sites because my issue with the V6 coolant bridge is a bit obscure so I was trying to widen the readership in the hope of finding someone who knew about the issue.

Offline agw9262

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Re: V6 Coolant bridge - banjobolt/temperature sensor
« Reply #3 on: March 15, 2021, 20:14:07 PM »
Our of interest, what was the reply - do you have a link to the post?


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Offline cphill

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Re: V6 Coolant bridge - banjobolt/temperature sensor
« Reply #4 on: March 15, 2021, 20:28:52 PM »
The link is: https://www.vauxhallcavalier.com/forum/viewtopic.php?f=6&t=17010&p=173541#p173541
The gist of it is that the combined temp sensor/banjo bolt is now pretty much unobtainable.
I did find one German supplier's web page that showed the item and a price (about 50 euros) but because of Brexit customs issues they are not now selling anything to the UK, even though they supply to several other non-EU countries.
There was also a Russian site that listed the item, but the site was all in Russian with no English translation and, anyway, I would be dubious about sending my credit card details to a Russian company.
I have at least established the GM part number for the item: 90462372.
Ho hum - such are the issues of trying to run a 1993 car!

Offline Jepwee

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Re: V6 Coolant bridge - banjobolt/temperature sensor
« Reply #5 on: March 16, 2021, 12:03:36 PM »
Hi, Try Keith at vauxhall green parts.co.uk. I can't see your part listed, but you never know. I have used him several times and found him very helpful.
 

Offline cphill

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Re: V6 Coolant bridge - banjobolt/temperature sensor
« Reply #6 on: March 16, 2021, 18:58:40 PM »
Thanks for this recommendation.
I tried Keith but unfortunately he isn't able to supply this item. According to a poster on the Cavalier Owners' club site, the "sensor" is just a simple bi-metallic switch that goes 'on' when a set temperature is reached. He replaced it on his V6 with a manual switch to turn on and off the alternator fan and secondary coolant pump as required - they normally run only just after the engine is turned off for a few minutes to prevent hot-spots.
An alternative would be any 12v bi-metallic switch that could just be clamped onto the coolant bridge... if i can locate something suitable....

Offline Jepwee

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Re: V6 Coolant bridge - banjobolt/temperature sensor
« Reply #7 on: March 17, 2021, 13:54:32 PM »
Hi, I know this sounds daft, but the bi-metal switch in a older electric kettle ? maybe be adjustable. As this is a temp switch voltage doesn't matter. The other idea is R S parts.
Hope this helps

Offline wdb2021

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Re: V6 Coolant bridge - banjobolt/temperature sensor
« Reply #8 on: May 07, 2021, 06:06:37 AM »
banjo bolt is a somewhat mysterious replacement part, I have no information on it.

Offline cphill

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Re: V6 Coolant bridge - banjobolt/temperature sensor
« Reply #9 on: May 07, 2021, 14:13:45 PM »
banjo bolt is a somewhat mysterious replacement part, I have no information on it.
It's actually a combined banjo bolt and coolant temp sensor which replaces the standard banjo bolt at one end of the coolant bridge on transversely mounted V6 engines. It is used to control the alternator cooling fan which is only required on transversely mounted V6 engines because, on these, the alternator lives at the rear of the engine next to the rear exhaust manifold and can overheat if not specifically cooled.
Instead of redesigning the coolant bridge to add an extra temp sensor port for transverse V6 engines, Vauxhall/Opel unfortunately took the cheaper way of combining a temp sensor with one of the banjo bolts. These are now unobtainable as far as I can see, presumably because of lack of demand.