Tech / General Engine Is your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
Sponsored by:
Sponsored by: CARiD

OK. What is this?

Thread Tools
 
Search this Thread
 
Old Jul 2, 2019 | 10:17 PM
  #1  
DaveyDug's Avatar
Thread Starter
Member
iTrader: (3)
 
Joined: Jul 2018
Posts: 288
Likes: 68
From: Ohio
Car: 1989 IROC
Engine: 5.7 TPI
Axle/Gears: 2.77 Posi
OK. What is this?

Saw this while replacing plugs and wires. It is hanging down on the passenger side near the starter. Seems that it should be attached to something...

'89 L98 IROC. I have no codes and the car runs good.

This picture was taken under the car looking up.



Last edited by DaveyDug; Jul 2, 2019 at 10:21 PM.
Reply
Old Jul 2, 2019 | 10:35 PM
  #2  
Tuned Performance's Avatar
Sponsor
20 Year Member
Community Builder
Community Influencer
Community Favorite
iTrader: (95)
 
Joined: Dec 2004
Posts: 16,808
Likes: 1,008
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: OK. What is this?

Ks or secondary fan temp switch
Reply
Old Jul 2, 2019 | 10:43 PM
  #3  
Drew's Avatar
Supreme Member
25 Year Member
Liked
Loved
Community Favorite
iTrader: (58)
 
Joined: Jul 1999
Posts: 20,310
Likes: 1,067
From: Salina, KS
Re: OK. What is this?

Fan switch is unplugged in the background, so that'd be obvious. The knock sensor is just above the oil pan rail in the middle of the block.

Reply
Old Jul 2, 2019 | 10:46 PM
  #4  
DaveyDug's Avatar
Thread Starter
Member
iTrader: (3)
 
Joined: Jul 2018
Posts: 288
Likes: 68
From: Ohio
Car: 1989 IROC
Engine: 5.7 TPI
Axle/Gears: 2.77 Posi
Re: OK. What is this?

Thank you, guys. Much appreciated.
Reply
Old Jul 2, 2019 | 10:49 PM
  #5  
Drew's Avatar
Supreme Member
25 Year Member
Liked
Loved
Community Favorite
iTrader: (58)
 
Joined: Jul 1999
Posts: 20,310
Likes: 1,067
From: Salina, KS
Re: OK. What is this?

BTW the connector is broken/melted. A new one is about $2 from Mouser, but shipping would suck.



https://www.mouser.com/ProductDetail...52BgV1HA%3D%3D

https://ecat.aptiv.com/feature?search=13510096
Reply
Old Jul 2, 2019 | 11:06 PM
  #6  
DaveyDug's Avatar
Thread Starter
Member
iTrader: (3)
 
Joined: Jul 2018
Posts: 288
Likes: 68
From: Ohio
Car: 1989 IROC
Engine: 5.7 TPI
Axle/Gears: 2.77 Posi
Re: OK. What is this?

The fan runs constantly when the engine is running. I assumed the previous owner wired it that way intentionally, but would the melted/disconnected connector cause the fan to run constantly?

The cooling fans are something I've been meaning to dig into, but frankly the car runs nice and cool as it is, and I've had enough other things to do with the car that have taken precedence.
Reply
Old Jul 3, 2019 | 01:09 AM
  #7  
Drew's Avatar
Supreme Member
25 Year Member
Liked
Loved
Community Favorite
iTrader: (58)
 
Joined: Jul 1999
Posts: 20,310
Likes: 1,067
From: Salina, KS
Re: OK. What is this?

The primary fan should come on around 220*. The secondary comes on when the A/C is on, or when commanded by the ECM. If it both come on with the key in run before hitting 220* and the A/C is off, the relays have probably been hotwired. It's a sloppy trick, but popular and easy. The fans don't need to run most of the time. The airdam pushes all the air necessary through the radiator as long as the car is moving. Having the fans run all the time is just wasted.
Reply




All times are GMT -5. The time now is 02:11 PM.