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gauge coolant sensor differences
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jvandyke  



Joined: 31 Mar 2016
Posts: 193
Location: Hudsonville, MI

PostPosted: Wed Dec 07, 2016 3:24 am    Post subject: gauge coolant sensor differences Reply with quote

car: '87 924s
engine; '83 944

temp gauge on dash always suspect, tended to read low, now inop.
When looking at sensors I see a difference between that listed for an '87 and those listed for an '83 2.5 from a 944.
What's the difference?
I'm not sure which part to go after for an accurate gauge reading.

The both "look" like this

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Grenadiers  



Joined: 20 Feb 2007
Posts: 3223
Location: Nelson, WI & Prescott, AZ

PostPosted: Wed Dec 07, 2016 3:36 am    Post subject: Reply with quote

Your engine is from an '84 944? Not sure on the differences, but, I'd go with the '87 924S part, to match the gauge.
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11332
Location: PacNW

PostPosted: Wed Dec 07, 2016 3:51 am    Post subject: Reply with quote

More likely a ground problem than the sender.
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jvandyke  



Joined: 31 Mar 2016
Posts: 193
Location: Hudsonville, MI

PostPosted: Wed Dec 07, 2016 5:48 am    Post subject: Reply with quote

I will go after grounds for the gauges then, first. Is there a good electric diagram floating around, this is all I can find, I have the 944 Haynes but that doesn't do me much good for body stuff.
http://www.pelicanparts.com/944/electrical/944_electrical_diagrams.htm
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Grenadiers  



Joined: 20 Feb 2007
Posts: 3223
Location: Nelson, WI & Prescott, AZ

PostPosted: Thu Dec 08, 2016 1:05 am    Post subject: Reply with quote

The main ground is up above, can't reach, spot under the windshield area, driver side. Looks like pop bottle tops upside down~! There are blade connections there, and they get corroded. If you remove the dash, much better access.
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Timmay!  



Joined: 22 Jul 2006
Posts: 214
Location: San Diego, CA

PostPosted: Sun Jan 29, 2017 2:03 am    Post subject: Reply with quote

Yes, 2 different sensors. Early has 1 contact for the gauge needle and the base is small diameter (doesn't penetrate water jacket in block) . Late has 2 contacts, one for the needle, one for the idiot light? , base is bigger and it sticks into the water inside the block.
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edredas  



Joined: 09 Dec 2004
Posts: 851
Location: Charlotte, NC

PostPosted: Sun Jan 29, 2017 7:21 am    Post subject: Reply with quote


Early 944 sensor


924S Sensor with single blade



Late 944 sensor with two blades. One for temp other for idiot light
I hope that helps!
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jvandyke  



Joined: 31 Mar 2016
Posts: 193
Location: Hudsonville, MI

PostPosted: Tue Feb 14, 2017 6:49 am    Post subject: Reply with quote

Thanks for that!!
Pretty sure we've got the first one pictured: the "button" single contact style.
Probably should have the 924s style to match the gauge, that would be the first thing to do.
BTW the gauge is "working" comes off stone cold and get's to about 1/4 and stays so likely it's just the wrong sensor/gauge combo.

Looks like the middle one is rare, Pelican doesn't show it, cheapest I've found is $80, ouch.
Wonder if one made for the VDO (non oem, right?) is the same resistance?
http://www.autoatlanta.com/results.php?partnumber2=Porsche%20Boxster%20Water%20Temp&narrowcar=924%201986-88&narrowsection=Electrical
Wonder if one of you guys has a used one?
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Paul  



Joined: 02 Nov 2002
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Location: Southeast Wisconsin

PostPosted: Tue Feb 14, 2017 2:05 pm    Post subject: Reply with quote

I'll look in the morning, don't buy anything from AA.
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jvandyke  



Joined: 31 Mar 2016
Posts: 193
Location: Hudsonville, MI

PostPosted: Wed Feb 15, 2017 12:25 am    Post subject: Reply with quote

I hear you about AA. Not happening. Been there.
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Paul  



Joined: 02 Nov 2002
Posts: 9285
Location: Southeast Wisconsin

PostPosted: Wed Feb 15, 2017 5:05 am    Post subject: Reply with quote

I have one. Email sent.

[img][/img]
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jvandyke  



Joined: 31 Mar 2016
Posts: 193
Location: Hudsonville, MI

PostPosted: Sat Feb 18, 2017 9:57 am    Post subject: Reply with quote

I assumed they were interchangeable, nope. early 944 "button" style smaller, can't put the 924s sensor (nor presummably the later 944 double spade) into the early 944 block. will have to either re-thread the block or get a different gauge. I'm trying to figure out how the early 944 and '87 924s temp gauge compare, maybe (since I think each gauge is individually mounted?) I can swap out just the temp gauge?
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Paul  



Joined: 02 Nov 2002
Posts: 9285
Location: Southeast Wisconsin

PostPosted: Sat Feb 18, 2017 2:17 pm    Post subject: Reply with quote

What color are your gauges? I may have one.
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Polar Silver 02 996TT. "Turbo"
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Paul  



Joined: 02 Nov 2002
Posts: 9285
Location: Southeast Wisconsin

PostPosted: Sat Feb 18, 2017 2:22 pm    Post subject: Reply with quote

Email sent.
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
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edredas  



Joined: 09 Dec 2004
Posts: 851
Location: Charlotte, NC

PostPosted: Sat Feb 18, 2017 8:07 pm    Post subject: Reply with quote

Ah, I thought they would be interchangeable too... I seldom come across a very early block so keeping track of everything is difficult. I have two "early" blocks, or at least what I consider them early since they have the 3-piece oprv and eccentric tensioner, but use the late temp sensor so I wasn't aware the size changed.
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'86 944 -Garnet, Fully loaded, Koni suspension
'87 924S -Red, 300hp 951 swap
'87 924S -Red, New Project
'87 924S -White, Automatic
'88 924S -Red, Daily Driver, Bone stock
'93 Mx6 -White, Megan Racing suspension
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