Coolant temperature switch?..
10-26-2009, 09:16 PM
#1
Registered User
Thread Starter
Join Date: Jan 2007
Posts: 69
Likes: 0
Received 0 Likes
on
0 Posts
Coolant temperature switch?..
accidentally broke the coolant temperature switch as i was putting the plenum back in place...went to autozone and got a new one. it broke off the wiring clip so i ended up having to crimp on another clip... so now after the change,.. at cold start the temperature needle quickly jumps to the hot side. doesnt stay at the middle like it should and constanly moves back and forth. please help?
10-27-2009, 07:42 PM
#7
Registered User
yea...thats kind of an important component there bud....just check everything before you drive it..you never can tell when its going to overheat...and THAT thing is what tells ya it is..lol
Trending Topics
10-27-2009, 08:29 PM
#8
Registered User
Join Date: Dec 2008
Location: DFW, Texas!
Posts: 1,015
Likes: 0
Received 0 Likes
on
0 Posts
10-27-2009, 09:29 PM
#9
Registered User
Join Date: Mar 2008
Location: Temecula Valley, CA
Posts: 12,723
Likes: 0
Received 4 Likes
on
4 Posts
Why doubt it? Thread sealing tape (teflon for instance) is not electrically conductive and since the coolant temp sender is single wire and grounds through the manifold, tape could insulate the sender resulting in erratic readings.
10-28-2009, 08:31 AM
#11
Registered User
Join Date: Mar 2008
Location: Temecula Valley, CA
Posts: 12,723
Likes: 0
Received 4 Likes
on
4 Posts
Yes, it can, but with much higher resistance than metal. Additionally, coolant has additives designed to reduce conductivity in order to reduce electrolysis of the dissimilar metals of the head (aluminum), block (iron) and radiator (copper). 
Last edited by abecedarian; 10-28-2009 at 08:33 AM.
10-28-2009, 08:47 AM
#12
Registered User
Join Date: Dec 2008
Location: DFW, Texas!
Posts: 1,015
Likes: 0
Received 0 Likes
on
0 Posts
bah! 
I've never had a problem using teflon tape on sending units, but then again I only put one layer on the threads. ISTR the FSM saying to use it, also.
Testing whether your teflon tape is inhibiting electrons is easy, just measure the resistance between the shell of the sender/switch and the block.
But here's my original point...
If you use enough teflon tape to completely isolate the sending unit from the block, you're doing it wrong.
When was the last time you backed something out that had teflon tape and the tape was still 100% intact?
I've never had a problem using teflon tape on sending units, but then again I only put one layer on the threads. ISTR the FSM saying to use it, also.
Testing whether your teflon tape is inhibiting electrons is easy, just measure the resistance between the shell of the sender/switch and the block.
If you use enough teflon tape to completely isolate the sending unit from the block, you're doing it wrong.
When was the last time you backed something out that had teflon tape and the tape was still 100% intact?
Last edited by Windsor; 10-28-2009 at 09:38 AM.
Thread
Thread Starter
Forum
Replies
Last Post
Blamalam
86-95 Trucks & 4Runners
22
03-12-2022 07:34 AM
JaredL
84-85 Trucks & 4Runners
14
03-28-2016 09:08 PM
Tacoma1313
95.5-2004 Tacomas & 96-2002 4Runners
2
08-17-2015 05:44 PM
