home register FAQ memberlist calendar

Go Back   Turbobricks Forums > Symposium > article composition

Reply
 
Thread Tools Display Modes
Old 01-01-2016, 10:28 PM   #1
84B23F
Board Member
 
84B23F's Avatar
 
Join Date: Feb 2008
Location: Kansas, USA
Default 240 Coolant Level Sensor

For around $10.00 (US) in parts (LED & Float), a cheap coolant level sensor can be created.

Stainless Steel Vertical Float - Ebay price around $6.00.

Green LED Pilot Light - Ebay price, around $5.00

On bottom side of coolant reservoir, I mounted the float. Between the top-edge of that center hole and that horizontal rib above it, I drilled out a hole in the center-line of those two points mentioned on bottom side with a drill press, via smaller drill bit first, then a larger sized bit. This is a top-side photo showing float.

I used a 4" side grinder on tank's bottom-mounting bracket so float's nut would seat within this bracket. When tightening nut, I used a hemostat (hemostatic clamp) to hold threaded part, and a wrench; once threaded part started to spin, I stopped tightening it.

One wire of float is hooked to a ground next to reservoir tank, and the other float wire goes thru firewall (where main wiring harness goes thru) and into vehicle's interior (inside, I fished wire across heater box), and hooked wire to ground side of LED light. For the positive wire, I hooked it to other side of LED, and ran this wire over to fuse box, and inserted it onto a fuse holder via alligator clamp.

Mounting LED - If mounted further inward on cluster, it will not seat flush, for LED I used.
It is mounted so when I'm driving at night, the steering wheel blocks this side light from my eyes; although dark nail polish could be used to block this side light. The cluster's night lights are not needed with LED mounted there. This 20ma draw LED is quite bright if pointed towards your eyes at night.

Operation - I have filled reservoir tank so when engine is cold, the LED will not be lit, except when anti-freeze solution is moving about. Once engine is warmed up, the LED stays lit most all of the time.

Footnote - Nothing fancy here, but I could have used a Bosch relay setup to set-off a buzzer. That float is good for a one amp draw, so using a 20ma LED does not overload it. Only with time will I be able to determine if an issue exist with float in tank; I have a spare tank in case there is an issue.
84B23F is offline   Reply With Quote
Old 01-01-2016, 11:00 PM   #2
Jack
junkman
 
Jack's Avatar
 
Join Date: Jul 2011
Location: oroville, ca
Default





Jack is offline   Reply With Quote
Old 01-12-2016, 06:28 PM   #3
nordmaschine
forced instruction
 
nordmaschine's Avatar
 
Join Date: Feb 2012
Location: The Balkans, BiH
Default

So, you used normally closed switch float - when your coolant level drops, light goes out?
__________________
Will race for food.
- '94 965 - BMW M50B25 engine and Getrag 260 transmission - burried in the garage.
- '90 744 turbo 16 valve - d̶a̶i̶l̶y̶ ̶d̶r̶i̶v̶e̶r̶ garden decoration
Quote:
Originally Posted by Kjets On a Plane View Post
Whiteblocks
Quote:
Originally Posted by AdmiralSenn View Post
I think I might be too stupid to own a car.
nordmaschine is offline   Reply With Quote
Old 01-12-2016, 06:51 PM   #4
84B23F
Board Member
 
84B23F's Avatar
 
Join Date: Feb 2008
Location: Kansas, USA
Default

Quote:
Originally Posted by nordmaschine View Post
when your coolant level drops, light goes out?
Correct...a fail-proof attribute.

Using a Bosch Relay, a person could have radio turn off, engine shut off, horn blow, or a light turn on or flash, but I wanted to keep it simple.


.
84B23F is offline   Reply With Quote
Old 01-14-2016, 05:02 AM   #5
nordmaschine
forced instruction
 
nordmaschine's Avatar
 
Join Date: Feb 2012
Location: The Balkans, BiH
Default

Why not closed? It is usually easier to notice light going on suddenly, than going off...
nordmaschine is offline   Reply With Quote
Old 01-14-2016, 10:33 AM   #6
84B23F
Board Member
 
84B23F's Avatar
 
Join Date: Feb 2008
Location: Kansas, USA
Default

Quote:
Originally Posted by nordmaschine View Post
Why not closed?
YMMV...I live in a rural area where mice/rats can chew on a vehicle's wiring. By seeing the light flicker and when staying on, I know the circuit is working.

As I noted,

Operation - I have filled reservoir tank so when engine is cold, the LED will not be lit, except when anti-freeze solution is moving about. Once engine is warmed up, the LED stays lit most all of the time.
84B23F is offline   Reply With Quote
Old 01-15-2016, 10:34 AM   #7
84B23F
Board Member
 
84B23F's Avatar
 
Join Date: Feb 2008
Location: Kansas, USA
Default

Quote:
Originally Posted by nordmaschine View Post
It is usually easier to notice light going on suddenly, than going off...
If outbound side of fuel-pump fuse is used to power LED light, one can see if power is going to fuel pumps when starting vehicle, btw.

Footnotes:

1. Sensor's total length: 55 mm (straight sensor) (ebay ad calls it 55, but it may be 60 mm)

2. I'm going to try this on a 1993-940, which has a different tank. I will try a 55 mm first, and then a 75 mm one, if needed. If this upper mounted setup works, it will work in the opposite way so the light will light up when fluid level is low/empty.

3. Photo of 55 mm sensor


Last edited by 84B23F; 01-15-2016 at 10:41 AM..
84B23F is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -4. The time now is 10:29 PM.

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2016, vBulletin Solutions, Inc.