2008 Toyota sienna righ fan alwasy running....

10

Asked by Sep 23, 2015 at 12:59 AM about the 2008 Toyota Sienna LE 8 Passenger

Question type: Maintenance & Repair

2008 Toyota sienna the right side fan runs as soon as key is in first position...I have full wiring diagrams and have replaced and switched around all the related the relays. I have replaced the fan control module twice (used), I have replaced the main ECU twice (both used ebay's but odds are they are not the problem). I know both fans work if hotwired so they are not the issue.  I have omed out related wires and circuits and chased back the wiring diagrams. I have tested the temp control unit and it works fine. I am stumped at this point. As a side note the AC is also not working and has a blinking light. I replaced the main AC relay with a new one, a known common problem on these cars. the AC gets cold if I "hotwire" the relay to always stay on but AC gauges shows rising pressure if i make it stay on all the time. AC gauges show normal expected pressures. First trying to figure out why just one fan runs all the time...second looking to solve the AC issues but not sure if they are related. Have been fixing cars for over 15 years and NEVER had to go to a shop for anything....just about there on this one....

1 Answer

10

Sorry a few other pieces of info about my post above....every once in a while the car can be totally cold, and the fan will kick on. I have an OBC scanner and the temp shows normal temps and goes up and down as expected. The relay that runs the fan, as well as several others have all been replaced or moved around to test. What else besides ECU, Fan Control Module, Temp sensor, or relays tells the fan to kick on....

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

  • 2008 Toyota Sienna with Heat problems 2 answers

    I just bought a 2008 Sienna a few months ago and has been a nightmare since. This is my 3rd Sienna and never had all these problems. The first issue was the water pump leaked so we had that fixed. T...

    2008 Toyota Sienna XLE Limited AWD

    -

    Maintenance & Repair

  • toyota sienna transmission 3 answers

    I am looking to buy a toyota sienna. I had it checked by a mechanic who said that the fluid was dirty and gritty which means that the transmission is going bad. It drives well, with no noticeable ...

    2003 Toyota Sienna

    -

    Maintenance & Repair

  • how do you drain water jacket on 2008 sienna? 10 answers

    Did radiator flush, but replaced with Prestone any color, not Toyota red. Two weeks later thermostat is sticking. Might be coincidence, but want to drain entire system and replace with one type of a...

    2008 Toyota Sienna

    -

    Maintenance & Repair

  • Where is the spare tire stored in 2008 Toyota Sienna Limited? 2 answers

    2008 Toyota Sienna XLE Limited

    -

    Maintenance & Repair

Search Toyota Sienna Questions

Toyota Sienna Experts

#1 Mik00000
Mik00000
Reputation 1,520
#2 Tom Demyan
Tom Demyan
Reputation 1,050
#3 FordNut
FordNut
Reputation 910
View All

Related Models For Sale

Used Honda Odyssey
350 Great Deals out of 27,970 listings starting at $2,295
Used Toyota Highlander
476 Great Deals out of 25,071 listings starting at $1,500
Used Chrysler Town & Country
442 Great Deals out of 20,513 listings starting at $1,695
Used Toyota Camry
1,094 Great Deals out of 96,265 listings starting at $1,250
Used Kia Sedona
139 Great Deals out of 9,357 listings starting at $1,999
Used Dodge Grand Caravan
308 Great Deals out of 34,366 listings starting at $1,995
Used Honda Pilot
461 Great Deals out of 19,637 listings starting at $599
Used Nissan Quest
93 Great Deals out of 3,088 listings starting at $995
Used Toyota RAV4
644 Great Deals out of 61,987 listings starting at $2,450
Used Toyota 4Runner
316 Great Deals out of 20,547 listings starting at $2,295
Used Toyota Corolla
868 Great Deals out of 74,427 listings starting at $1,500
Used Toyota Sequoia
165 Great Deals out of 5,986 listings starting at $1,495
Used Toyota Tacoma
614 Great Deals out of 35,124 listings starting at $2,155
Used Honda CR-V
813 Great Deals out of 59,368 listings starting at $1,200
Used Chrysler Pacifica
60 Great Deals out of 26,500 listings starting at $2,950

Used Cars For Sale

2017 Toyota Sienna For Sale
4 Great Deals out of 17,368 listings starting at $27,485
2016 Toyota Sienna For Sale
17 Great Deals out of 1,175 listings starting at $21,117
2015 Toyota Sienna For Sale
34 Great Deals out of 1,410 listings starting at $14,977
2014 Toyota Sienna For Sale
43 Great Deals out of 1,827 listings starting at $11,994
2013 Toyota Sienna For Sale
31 Great Deals out of 970 listings starting at $9,693