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Discussion Starter · #1 ·
So here it is.... Ive got a 2009 XB (Bone Stock NO MODS) and just hit 60,000 miles.

Car has a few issues that I would like to resolve, and the first issues I think may all be affected by each other.

1. Car idles around 500 rpms when at a traffic light and in gear, causes the whole front end to vibrate and the hood to vibrate from being at such a low idle. (Been reading about cleaning the idle control valve area in the opening of the throttle body as well as the MAF sensor to see if this helps at all)

2. When at a traffic light, the fan comes on for about 20 secs and then back off, and then turns back on.... and it does this over and over again.... very annoying

3. Living in Fresno CA, the summers are brutal HOT !! The AC does not work when at an idle and stopped. When driving it blows freezing cold air, but when I stop at a traffic light it will start to blow warm air within about 30 to 45 secs. (Basically what ive found is that the compressor kicks off because the pressure reaches a high pressure, and the system is protecting itself and shutting off just as it should) BUT WHY IS IT OVER PRESSURIZING WHEN STOPPED AND FINE WHEN DRIVING ???

So my question is..... is the low idle maybe causing all of these issues ???

I would love to buy a Haynes manual and trouble shoot all of this stuff, BUT THEY DONT EXIST !!!

So any feedback and help is a great help, and I thank anyone who responds in advance....
 

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Car idles around 500 rpms when at a traffic light and in gear....
From your description I'm guessing that you have an automatic (because you say "in gear").

I'm further guessing that if you are stopped and the car is put in Neutral that none of these problems happen?

If so, then I think the idle is set too low, and/or the switch/mechanism to kick up the idle when the AC compressor is working is not functioning. 500 rpm seems kind of low...
 

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my Honda fit sport used to do the thing with the fan kicking on and off. Super annoying so I know exactly how you feel lol. It was an easy fix and I believe its the same for the xb... Where do you leave your hvac controls set at? If ita on any of the defrost modes the fan will cycle on and off even if the blower is set to 0. Try just setting it to the feet setting and see if that stops the fan from cycling.
 

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Discussion Starter · #4 ·
Yes it's an automatic and yes, if I put it in neutral the idle comes up.

I keep my climate control on defrost/floor and normally always on 1 fan setting.

I have also noticed that even when on vent mode with temp on cold, AC off, I get heat through the vents. So something is going on wrong there too. I'm not getting cool vented outside air coming through the vents.

As far as the idle, how would I adjust the idle ?? Other then cleaning the throttle body idle circuit area/port and the MAF sensor.
 

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your fan is probably cycling because its always on defrost. Next time you're just sitting there in your car turn it off the defrost setting and see if the fan still cycles. If sorry I can't help with any of the other issues though.
 

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I unhooked my battery when painting the rear rocker panel on my car and didn't want the battery to die with the door open. After hooking it back up it idled at around 500rpms and would almost die at lights. This sucked for me because Im in a manual and got used to hitting the gas "x"amount to take off but with this new idle I was having to bury it.

I scoured the internet looking for a resolution and SURPRISE! Our cars are techy as bawls. Since the computers in these cars control EVERYTHING there are not fuel/air screws i could find, and the only solution I found was to start the car and just let it sit for 10 minutes all by it self and don't touch anything.

I thought that was a terrible idea but was out of other options so I tried it and sure enough my idle is now back up to 750-1000. May be worth a shot to just unhook the battery for a few minutes and let it sit and reset everything.
 

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I unhooked my battery when painting the rear rocker panel on my car and didn't want the battery to die with the door open.
Just FYI, our cars have an auto shutoff that turns off the dome light when a door is left open after about 15 minutes. I've worked on my car with the doors open for hours with no ill effects. The power is restored when you close a door. There is also a manual switch to turn off the dome light.

Not sure if the auto shutoff will also turn off our headlights after 15 minutes...haven't had the guts to try that one...
 

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That's good to know, but not certain mine functions or has that. My dome light was on the other night when I went out. I guess I could have just hit the switch on it but was more focused on getting the surface rust sanded and covered before the sun went down. It was probably the only reasonable day we had all winter and I didn't want to cake salt all over it so I went ahead to do it.

Either way for some reason the idle dropped way low after and some how the 10 minute thing fixed it. I was pretty surprised by it.
 

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Discussion Starter · #11 ·
Well I know my original post is quite old but I thought I would give some feedback since I just figured out my entire issue.

So the problem ended up being the drivers fan wiring was reversed, causing the one fan to push instead of pull.

Can you believe it was something that easy and that retarded. Lol

The clip below the battery for the fan looked to of been messed with and it was barely seated and pushed on in the wrong direction. The fix was simple, pull the battery to gain easier access. Push the plug on the right direction and make sure it seats and then reinstall the battery. The fan is now pulling air through the radiator.

The fan was taking such a load pushing against the radiator that it was causing an extended pull on the 12 volt system that it was causing a rough idle.

The fan was actually pushing hot air into the radiator causing the ac to go into protected mode when the ac stem pressure rises and shutting off when not driving.

And then fan kicked on and off constantly because at low fan speed it was actually heating up the radiator causing the fan to have to go to high speed every 30 seconds.

PROBLEM SOLVED !!!

Word for everyone here. Don't always look at the most difficult solution and over thing some of these issues. Te problem is more than 75% of the time the easiest an most overlooked solution.

Thanks again for everyone's help over the last couple years.
 

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That reminds me of many years ago my car wouldn't go over 20 mph. I thought it was a fuel pump,so I got one and it took most of the day to install because the push rod in the block kept falling out of position. Come to find out, it was only a fuel filter (a couple of bucks). So you are right, look at the most simple things first.
 

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The clip below the battery for the fan looked to of been messed with and it was barely seated and pushed on in the wrong direction.
And now the question is: how did THAT happen? I can't believe it came from the factory that way and you didn't notice it for 60K miles. Sloppy maintenance? Hopefully it wasn't done by a dealer...because then there would be no excuse...
 
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