 Both Fans Run All the Time...Solution Question, 5SFE |
 Sep 3, 2013 - 12:34 PM
|
 
|
|
Enthusiast  Joined Oct 25, '12 From Pennsylvania Currently Offline Reputation: 0 (0%)  |
Hi Guys.
Both of my 1997 2.2 5SFE fans run constantly, even after turning the ignition to "On" in the morning, but not starting the engine. A quick search here suggests the problem is the Engine Coolant Temperature Switch, located at the bottom rear of the radiator. Before draining my coolant, I thought that if this is the problem, disconnecting the wire from old and connecting it to the new without installing it into the radiator should keep the fans off with a cold engine (or just turning the ignition to ON without starting a cold engine). Does that sound about right to anyone? Also, does this look like the right part: http://shop.advanceautoparts.com/webapp/wc...bwd_18970379-p# It looks right to me, but Advance Auto has given me the wrong parts before.... Oh Yeah! Do the threads need Teflon tape, or any other type of sealant? TIA!!! |
 |
Replies
|
Sep 11, 2013 - 2:48 AM
|
|
|
Enthusiast Joined Mar 3, '05 From Richmond, B.C. Currently Offline Reputation: 0 (0%) |
Toyota designed the system so that if the fan temperature switch fails, the fans run constantly -- better to have a cold radiator which still allows the thermostat to control temperature than to boil the coolant.
Unfortunately, that's not your problem. The switch should have continuity when cold (below 83C) so that it can interrupt the fan circuit and turn the fan off. From the factory repair manual: 1. INSPECT WATER TEMPERATURE SWITCH (4A–FE) (a) Using an ohmmeter, check that there is no continuity between the terminal and switch body when the coolant temperature is above 93°C (199°F). (b) Using an ohmmeter, check that there is continuity between the terminal and switch body when the coolant temperature is below 83°C (181T). If continuity is not as specified, replace the switch. (3S–GTE and 5S–FE) (a) Using an ohmmeter, check that there is no continuity between the terminals when the coolant temperature is above 93°C (199°F). (b) Using an ohmmeter, check that there is continuity between the terminals when the coolant temperature is below 83°C (181 °F). If continuity is not as specified, replace the switch. |
Posts in this topic
FrankB2 Both Fans Run All the Time...Solution Question Sep 3, 2013 - 12:34 PM
ILoveMySilly97 That's incorrect. If you buy a new one and don... Sep 3, 2013 - 1:33 PM FrankB2 I was hoping that just plugging it in would indica... Sep 3, 2013 - 1:52 PM Smaay QUOTE (ILoveMySilly97 @ Sep 3, 2013 - 11... Sep 3, 2013 - 2:41 PM FrankB2 I'm just about to leave for the parts store, a... Sep 3, 2013 - 3:07 PM FrankB2 Well.... That didn't work. I took the fan out,... Sep 3, 2013 - 4:22 PM Syaoran Your fans were most likely hardwired into the igni... Sep 3, 2013 - 5:12 PM Batman722 Mess with the AC at all lately ?
These is a press... Sep 3, 2013 - 6:18 PM FrankB2 Thanks Guys! I'll check for the pressure s... Sep 3, 2013 - 7:06 PM FrankB2 ARGHHHHH!!! I really did it now. I dec... Sep 4, 2013 - 1:56 PM Smaay check your ECU and wiring grounds. my All-Trac did... Sep 4, 2013 - 4:57 PM FrankB2 Hi Smaay,
It seemed weird that the idle was droppi... Sep 4, 2013 - 5:23 PM Roadrash I know its a different path to fix a problem.... b... Sep 6, 2013 - 11:17 PM FrankB2 Yeah! I saw one of those on Autozone's web... Sep 7, 2013 - 12:38 PM FrankB2 Update:
I tested the coolant temp switch in the ra... Sep 7, 2013 - 2:36 PM FrankB2 That's what I've been suspecting to be the... Sep 11, 2013 - 7:51 AM FrankB2 Double post... See post below. Sep 12, 2013 - 1:00 PM FrankB2 Yeehaaa..... Think I've got it. Found a troubl... Sep 12, 2013 - 1:00 PM
Special_Edy You should pull the efi relay or another fan relay... Sep 12, 2013 - 10:00 PM |
6 User(s) are reading this topic (6 Guests and 0 Anonymous Users)
0 Members:
| Lo-Fi Version | Time is now: January 10th, 2025 - 10:12 AM |