secondary fan doesn't always work

Reply Subscribe

Thread Tools

Search this Thread

Sep 2, 2005 | 12:16 AM

dmo55ford

Thread Starter

Intermediate

Joined: Oct 2004

Posts: 25

Likes: 0

From: Brentwood NO. California

secondary fan doesn't always work

My 92 the secondary fan is not coming on at temp. When I run the A/C both come on. Changed the coolant temp sensor, still no luck.

Any ideas?

Thanks

D

Sep 2, 2005 | 07:34 AM

jackdaroofer

Race Director

Joined: Dec 1999

Posts: 11,182

Likes: 2

From: Almost all Skyline Cruises Vettes at Waterside 1-5

Cruise-In I Veteran

Cruise-In II Veteran

Cruise-In III Veteran

Cruise-In IV Veteran

Cruise-In V Veteran

Cruise-In VI Veteran

Cruise-In VII Veteran

Quote:

Originally Posted by dmo55ford

My 92 the secondary fan is not coming on at temp. When I run the A/C both come on. Changed the coolant temp sensor, still no luck.

Any ideas?

Thanks

D

92's may be different, but on my 88, there is the coolant temp sensor on the right cylinder head near the back and a temp switch for the aux fan on the left head betwee # 1 & # 3,

I have had the lead come off that switch and the fan not work.

Not sure if this helps, but it's a bump anyway

seeya

Sep 2, 2005 | 10:15 AM

Aardwolf

Race Director

Joined: Jun 2004

Posts: 13,961

Likes: 707

From: WI

Your car may not be getting hot enough to turn that fan on. What temp. are you getting to when noticing the second fan does not turn on? There are different temp. switches to turn the fan on sooner.

Sep 2, 2005 | 07:43 PM

c4cruiser

Team Owner

Joined: Dec 1999

Posts: 34,873

Likes: 487

From: Lacey WA RVN 68-69

NCM Sinkhole Donor

On the 92, the secondary fan turns on when the coolant temp sensor sees 226 degrees F and turns it off when the coolant temp drops 41 degrees F.

If the oil temp sensor sees 228 degrees F, the secondary fan will run. Once the oil temp drops 36 degrees F, the fan will shut off.

Minimum run time for the secondary fan is 30 seconds. As you have seen, turning the A/C on forces the secondry fan to operate.

Operation of the secondary fan is controlled by the ECM by sending a signal to the secondary fan relay. The ECM takes input from the coolant temp sensor, oil temp sensor. throttle position, vehicle speed, engine speed and the A/C condenser pressure.

Also if ECM codes 14, 15, 52, or 62 are set, the secondary fanb will run constantly.

So, if you are not seeing coolant temps above 226, and/or oil temps above 228, the secondary fan will not run.

Sep 2, 2005 | 07:51 PM

jackdaroofer

Race Director

Joined: Dec 1999

Posts: 11,182

Likes: 2

From: Almost all Skyline Cruises Vettes at Waterside 1-5

Cruise-In I Veteran

Cruise-In II Veteran

Cruise-In III Veteran

Cruise-In IV Veteran

Cruise-In V Veteran

Cruise-In VI Veteran

Cruise-In VII Veteran

Quote:

Originally Posted by c4cruiser

I guess 92's are different. On my 88, the secondary switch in the left side head turns the fan on. As someonelse here mentioned, you can buy aftermarket switches tha bolt into the head and will turn on the aux fan at 196 deg

Jack

Reply Subscribe

Reply Share

First
Prev
1 / 1
Next
Last

Forum Jump