Author Topic: '70 Deville - mechanical water temp gauge - how to run thru the firewall?  (Read 166 times)

Offline grantatx

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  • Name: G. Scanlen
Hi All,

I purchased a mechanical water temp gauge without thinking about how I would put the capillary tube through the firewall. Has anyone managed to do this without drilling another hole, which I definitely do not want to do. If so, which existing hole did you use? If I can't find a way to do this I guess I'll end up buying an electrical gauge.


Thanks in advance!

Grant

Offline The Tassie Devil(le)

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Re: '70 Deville - mechanical water temp gauge - how to run thru the firewall?
« Reply #1 on: November 24, 2017, 11:52:02 PM »
The largest grommet you could possibly use is the one for the Speedo cable.

This one has a large firewall hole, to accommodate the speedo end, which should also suit the Temp Sender end of the capillary tube, but you will need to cut a slot in the grommet to allow the tube to be centralised.

Bruce. >:D
 
'72 Eldorado Convertible (LHD)
'70 Ranchero Squire (RHD)
'74 Chris Craft Gull Wing (SH)
(Past President Modified Chapter)

Online cadillacmike68

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  • Name: M Santos
Re: '70 Deville - mechanical water temp gauge - how to run thru the firewall?
« Reply #2 on: November 25, 2017, 05:55:11 AM »
Or you can use one of the unused spots in the oval shaped vacuum pass thru located nearby. You can also check for any unused connections in the main firewall electrical connector. you'll need the shop manual for that.
Regards,
"Cadillac" Mike
Current:
1968 DeVille Convertible
1996 Fleetwood Brougham
2009 STS NorthStar Platinum ed RWD
2011 CTS PRemiun ed Sedan RWD
Past:
2008 CTS Premium ed Sedan AWD
2005 CTS Hi-Feature Sedan RWD
2000 ElDorado ESC Hard Boot Convertible
1995 Fleetwood Brougham
1973 Sedan DeVille
1970 Fleetwood Brougham
1969 DeVille Convertible

Offline chrisntam

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Re: '70 Deville - mechanical water temp gauge - how to run thru the firewall?
« Reply #3 on: November 25, 2017, 05:59:41 AM »
There's a grommet on the left side that has multiple "holes" for lines to pass thru it.  Take it out, open one of the holes and snake it through.

It's between the master cylinder and the driver fender, kinda up high if I recall.  Out of town right now, sorry, no pics....
1970 Deville Convertible  MTS 507
Dallas, Texas

Online cadillacmike68

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Re: '70 Deville - mechanical water temp gauge - how to run thru the firewall?
« Reply #4 on: November 25, 2017, 06:37:29 AM »
Chris, I believe that's the one that has vacuum lines. There's always at least one available spot.
Regards,
"Cadillac" Mike
Current:
1968 DeVille Convertible
1996 Fleetwood Brougham
2009 STS NorthStar Platinum ed RWD
2011 CTS PRemiun ed Sedan RWD
Past:
2008 CTS Premium ed Sedan AWD
2005 CTS Hi-Feature Sedan RWD
2000 ElDorado ESC Hard Boot Convertible
1995 Fleetwood Brougham
1973 Sedan DeVille
1970 Fleetwood Brougham
1969 DeVille Convertible

Offline grantatx

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  • Name: G. Scanlen
Re: '70 Deville - mechanical water temp gauge - how to run thru the firewall?
« Reply #5 on: November 25, 2017, 09:20:02 AM »
Thanks very much for the replies everyone! Just about to head out to the garage and try your suggestions, will report back once done.

Grant

Offline TJ Hopland

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Re: '70 Deville - mechanical water temp gauge - how to run thru the firewall?
« Reply #6 on: November 25, 2017, 12:33:06 PM »
An additional issue you may run into is the length of the 'cable'.   These are long engines in big cars with the coolant ports on the front of the engine so you can't take too many detours along the way.   Luckily you don't have the additional length of the Eldorado where the back of the engine is more than a foot away from the firewall. 
StPaul/Mpls, MN USA

73 Eldo convert w/FiTech EFI
75 Eldo rusty but trusty
80 Eldo Diesel
And other assorted stuff I keep buying for some reason

Offline grantatx

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  • Name: G. Scanlen
Re: '70 Deville - mechanical water temp gauge - how to run thru the firewall?
« Reply #7 on: November 26, 2017, 09:41:08 PM »
Well I got the gauge and line installed, ended up using an existing hole that accommodates a vacuum line. See pic attached. Thanks again everyone for all your help!

Grant
« Last Edit: November 26, 2017, 09:44:21 PM by grantatx »

Online cadillacmike68

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Re: '70 Deville - mechanical water temp gauge - how to run thru the firewall?
« Reply #8 on: November 26, 2017, 10:44:02 PM »
That's the place I was thinking of.
Regards,
"Cadillac" Mike
Current:
1968 DeVille Convertible
1996 Fleetwood Brougham
2009 STS NorthStar Platinum ed RWD
2011 CTS PRemiun ed Sedan RWD
Past:
2008 CTS Premium ed Sedan AWD
2005 CTS Hi-Feature Sedan RWD
2000 ElDorado ESC Hard Boot Convertible
1995 Fleetwood Brougham
1973 Sedan DeVille
1970 Fleetwood Brougham
1969 DeVille Convertible

Offline bcroe

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'70 Deville - mechanical water temp gauge - how to run thru the firewall?
« Reply #9 on: November 26, 2017, 11:21:43 PM »
That ought to work; same type I use, which works even after shutdown.  Mine
has a 270 degree scale allowing a very compact 1.5" face.  A bit of a loop
between the firewall and the engine will reduce fatigue from engine motion;
even so I expect failures after high miles.  Bruce Roe