06 Honda Odyssey Cooling fans not on when Temp over 90C,THKS

最近發現自己的06 Honda Odyssey(270 K 公裏）在等紅燈時overheating when AC Not on，車載OBDII藍牙App showing coolant 溫度讀數可到96C or even higher , 但是radiator cooling fan and condensor fan 都不啟動; put AC on, (AC working properly without issues),  both Radiator and condensor fans are on low speed immidiately，cooling down the Coolant termparature to normal 85- 87c, this is how i am doing now to keep my engine from overheating again.

my diagnose logic is: If both Fans are on when AC on, can we say the Fans' raleys/ fuses, Fans motor and wiring are all good? no matter if low speed or high speed are required? if so, should the CTSs(Coolant temparature sensors, 2 of them in upper and lower hoses) be the culpits which not functioning properly to close the loop to send signals to Raley to trigger the high speed fans? as there are two CTSs, one is on Thermostat housing to Upper hose (hot coolant out of engine), another one is close to lower hose back in engine, which one is controling the highspeed fans to kick-in  when Coolant is over 90C? or both? if the CTSs are bad, how could the 車載OBDII藍牙App still have a reading? or the reading is irrelavant to the switch on/off?

One more thing might need to add into consideration, I was adding in a transmission cooler two years ago in front of the radiator to cool down ATF to tow a small trailer, working fine, but not this year, no towing.

thanks!

所有跟帖： 

• 不算太高，但你可以拆洗一下前麵水箱的“棉花絮“(如果有)，每三年換原廠冷卻液非常重要 -老金工- ♂ (682 bytes) () 09/12/2022 postreply 10:07:46

• tks, but if AC not on, temparature keep climbing -mountrobson- ♂ (203 bytes) () 09/12/2022 postreply 10:15:32

• 如果車載水溫表指針在C－H的中間(略偏C)，表示循環係統很健康(我二個08車如此)，如果 -老金工- ♂ (209 bytes) () 09/12/2022 postreply 10:24:19

• what was the coolant temperature gauge reading? -MoonRiverMe- ♂ (78 bytes) () 09/12/2022 postreply 10:11:10

• dashboard gauge reading is normal, -mountrobson- ♂ (157 bytes) () 09/12/2022 postreply 10:17:46

• Go check cts you said -MoonRiverMe- ♂ (0 bytes) () 09/12/2022 postreply 17:08:29

• 到270k公裏，換過coolant 嗎？flash 換coolant 看看 -soccer88- ♂ (0 bytes) () 09/12/2022 postreply 11:11:20

• 足版，the coolant changed when i bought it from previous owner -mountrobson- ♂ (431 bytes) () 09/12/2022 postreply 12:01:25

• 換過thermostat嗎？看看這個，便宜 -soccer88- ♂ (212 bytes) () 09/12/2022 postreply 12:46:17

• 足版，車子升溫正常，駕駛時溫度穩定在85-87, 隻有怠速駐車時發現溫度升高而風扇未如期介入， -mountrobson- ♂ (86 bytes) () 09/13/2022 postreply 08:58:58

• Nothing to do with coolant, nor thermostat -MoonRiverMe- ♂ (0 bytes) () 09/12/2022 postreply 17:09:33

• 過熱的參照係是正常工作溫度範圍，這個範圍是多少呢？按你簡略的描述 -Oneshotkill- ♂ (530 bytes) () 09/12/2022 postreply 11:13:05

• sorry for confusion, "Overheating" for me is when Temp keep -mountrobson- ♂ (308 bytes) () 09/12/2022 postreply 11:48:56

• 你的車子工作正常。 -TBz- ♂ (417 bytes) () 09/12/2022 postreply 13:04:08

• 會不會是thermostate 工作不正常，沒有完全打開。行車中流動空氣降溫，所以 -石島- ♂ (80 bytes) () 09/12/2022 postreply 13:46:12

• this would be another possibility as Soccer mentioned -mountrobson- ♂ (93 bytes) () 09/13/2022 postreply 11:22:14

• 支你一招 -MoonRiverMe- ♂ (181 bytes) () 09/12/2022 postreply 17:26:55

• Jump the switch? good idea! will try once got some time -mountrobson- ♂ (0 bytes) () 09/13/2022 postreply 08:33:42

• bypass the switches -MoonRiverMe- ♂ (0 bytes) () 09/13/2022 postreply 10:37:15

• Yes, thanks for the idea--it will narrow down the issue -mountrobson- ♂ (243 bytes) () 09/13/2022 postreply 10:52:40

• That fan is controlled by both AC and coolant temperature -MoonRiverMe- ♂ (49 bytes) () 09/13/2022 postreply 15:00:15

• 一般CTS壞了會有code，比如P0118 -soccer88- ♂ (0 bytes) () 09/12/2022 postreply 18:32:50

• 隻有線路有問題或sensor沒有信號才會觸發code，TCS就是一個溫度開關而已 -MoonRiverMe- ♂ (83 bytes) () 09/12/2022 postreply 18:40:30

• 是的，的查，有可能，但不能確定，也許就是老車了；老車如果清理不好散熱器裏麵細管子都堵了 -soccer88- ♂ (0 bytes) () 09/12/2022 postreply 19:43:05

• 96 C不算高啊 -biglow- ♂ (38 bytes) () 09/12/2022 postreply 18:36:00

• 他先得搞清了Fan啟動也就是Fan Switch接通時的溫度 -MoonRiverMe- ♂ (0 bytes) () 09/12/2022 postreply 18:45:54

• 93c -MoonRiverMe- ♂ (152 bytes) () 09/12/2022 postreply 18:48:29

• 通過網上功課，結論也是這個，90ish C 大多引擎設計是在這個溫度啟動風扇 -mountrobson- ♂ (0 bytes) () 09/13/2022 postreply 09:02:25

• 樓版，96c 是不高(曾超過100，沒試過最高），但是一直攀升而冷卻風扇不啟動，這個就是問題了 -mountrobson- ♂ (281 bytes) () 09/13/2022 postreply 08:46:45

• 老車跑累了喘幾下正常 -修車工- ♂ (0 bytes) () 09/12/2022 postreply 19:33:32

• 我的Accord有兩個temperature sensors。dashboard上看到的是其中一個sensor的結果。另 -霧蒙蒙雨霏霏- ♀ (207 bytes) () 09/12/2022 postreply 20:06:01

• 如果是我就換了，簡單 -修車工- ♂ (0 bytes) () 09/12/2022 postreply 21:09:42

• 要想不浪費時間浪費錢去換最簡單不過了 -MoonRiverMe- ♂ (114 bytes) () 09/12/2022 postreply 21:21:20

• DIY所有的樂趣就是診斷過程，案例拿來請各位大拿會診一下，能學到很多，確診後對症下藥，這才有成就感，嗬嗬 -mountrobson- ♂ (0 bytes) () 09/13/2022 postreply 11:03:36

• 你的問題的根源在此 -TBz- ♂ (238 bytes) () 09/13/2022 postreply 11:32:57

• TBz, 沒錯，折騰折騰車不就是這個論壇的目的嗎，預防總比故障突現不知所以好吧 -mountrobson- ♂ (0 bytes) () 09/13/2022 postreply 12:40:46

• 老車別折騰，哪壞修哪，沒壞別去動。 -TBz- ♂ (92 bytes) () 09/13/2022 postreply 17:53:42

• 多謝建議！不過風扇不轉要修啊！平時就是正常保養，換換油，早過了DIY初期愛折騰的勁了 -mountrobson- ♂ (0 bytes) () 09/14/2022 postreply 08:19:43

• 風扇不轉要修，我前麵已經給你建議了。 -TBz- ♂ (0 bytes) () 09/14/2022 postreply 15:40:26