Car overheating - Ford Focus Forum, Ford Focus ST Forum
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Ford Focus Forum, Ford Focus ST Forum > Ford Focus Tech Discussions > General Technical Chat

General Technical Chat This section is for technical discussions relating to general maintenance, electrical issues, engine trouble, and recalls.

Search This Forum | Image Search | Advanced Search    
Ford Focus Tire & Wheels FocusFanatics Merchandise

Reply
 
Thread Tools Display Modes
Old 03-22-2013, 01:39 PM   #1
leemanfor
Focus Rookie
 
Join Date: Jun 2012
Fan#: 100464
Location: Aurora, CO
What I Drive: 2008 Cobalt SS/Turbo

Posts: 10
FF Reputation: 1 leemanfor Good Standing Member
Buy-Sell-Trade Rating: (0)
Car overheating

Hello all

I haven't really ever had any issues with my wifes 2011 Ford Focus! its a great car and much more comfortable than mine haha.

Anyway, we were driving last night on the freeway and all of the sudden the temp gauge on the car went to H and the temp light came on saying its overheating. I panic and pull over and shut the car off immediately. Mind you the temp outside was 30 degrees.

I get out, check the car. No coolant loss...i got under the car and there was no wet leaks anywhere...the overflow tank is completely full and not really hot. no boiling water. Basically no sign that the car was actually over heating.

I get back in, and start it up and the temp reads normal. Now my thought is possibly a bad thermostat but the car has 42k miles and this is the first time this has happened.

Any thoughts?

Thanks!


leemanfor is offline  
    Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 03-22-2013, 02:38 PM   #2
bile0026
Focus Enthusiast
 
bile0026's Avatar
 
Join Date: Apr 2012
Fan#: 97349
Location: duluth, MN
What I Drive: 2009 Amber Gold Metalic Focus

Posts: 321
Points 367, Level 7
Points: 367, Level: 7 Points: 367, Level: 7 Points: 367, Level: 7
Level Up 34% Completed
Level up: 34% Level up: 34% Level up: 34%
Forum Activity 1%
Activity: 1% Activity: 1% Activity: 1%
FF Reputation: 7 bile0026 Good Standing Member
Buy-Sell-Trade Rating: (0)
Maybe an air bubble in the system. IIRC the coolant temp sensor is a "hydro sensor" meaning it will only read liquid temps not air temps. If an air pocket gets stuck around the sensor it won't be able to read the temp and I believe that it will cause it to read Hot (not 100% sure). The car can also overheat if there is an air pocket that is causing the coolant not to circulate. I would get the coolant flushed or "burp" it with one of these (a lot less messy with one of these). Its somewhere to start anyways.


If there is an air bubble you may want to check for a pinhole leak in one of the coolant hoses or check for a weak clamp that may be allowing air into the system. Otherwise you might end up back in the same boat.
__________________
2009 Ford Focus Sedan SE--Amber Gold Metallic--FS Cool-flo intake, 17" Black Kazera Rims with Potenza S-04PP, Custom 2.5" Exhaust.
bile0026 is offline  
    Reply With Quote Quick reply to this message
Old 03-22-2013, 02:42 PM   #3
leemanfor
Focus Rookie
 
Join Date: Jun 2012
Fan#: 100464
Location: Aurora, CO
What I Drive: 2008 Cobalt SS/Turbo

Posts: 10
FF Reputation: 1 leemanfor Good Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by bile0026 View Post
Maybe an air bubble in the system. IIRC the coolant temp sensor is a "hydro sensor" meaning it will only read liquid temps not air temps. If an air pocket gets stuck around the sensor it won't be able to read the temp and I believe that it will cause it to read Hot (not 100% sure). The car can also overheat if there is an air pocket that is causing the coolant not to circulate. I would get the coolant flushed or "burp" it with one of these (a lot less messy with one of these). Its somewhere to start anyways.


If there is an air bubble you may want to check for a pinhole leak in one of the coolant hoses or check for a weak clamp that may be allowing air into the system. Otherwise you might end up back in the same boat.
That makes sense. It would read hot air and not hot temp, so therefor going all the way to H.
leemanfor is offline  
    Reply With Quote Quick reply to this message
Old 03-22-2013, 02:49 PM   #4
bile0026
Focus Enthusiast
 
bile0026's Avatar
 
Join Date: Apr 2012
Fan#: 97349
Location: duluth, MN
What I Drive: 2009 Amber Gold Metalic Focus

Posts: 321
Points 367, Level 7
Points: 367, Level: 7 Points: 367, Level: 7 Points: 367, Level: 7
Level Up 34% Completed
Level up: 34% Level up: 34% Level up: 34%
Forum Activity 1%
Activity: 1% Activity: 1% Activity: 1%
FF Reputation: 7 bile0026 Good Standing Member
Buy-Sell-Trade Rating: (0)
Not quite. The way the sensor is designed it won't read air at all which I think makes it jump to H so that if there was no coolant in the radiator you would know. Liquid temp sensors only work in liquid, they can't read air temps.
__________________
2009 Ford Focus Sedan SE--Amber Gold Metallic--FS Cool-flo intake, 17" Black Kazera Rims with Potenza S-04PP, Custom 2.5" Exhaust.
bile0026 is offline  
    Reply With Quote Quick reply to this message
Old 03-22-2013, 02:52 PM   #5
FordService
Official Ford Rep
 
FordService's Avatar
 
Join Date: Oct 2010
Fan#: 79824
Location: Dearborn, MI
What I Drive: Ford Focus

Posts: 4,354
Points 3,151, Level 34
Points: 3,151, Level: 34 Points: 3,151, Level: 34 Points: 3,151, Level: 34
Level Up 68% Completed
Level up: 68% Level up: 68% Level up: 68%
Forum Activity 15%
Activity: 15% Activity: 15% Activity: 15%
FF Reputation: 18 FordService Great Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by leemanfor View Post
Hello all

I haven't really ever had any issues with my wifes 2011 Ford Focus! its a great car and much more comfortable than mine haha.

Anyway, we were driving last night on the freeway and all of the sudden the temp gauge on the car went to H and the temp light came on saying its overheating. I panic and pull over and shut the car off immediately. Mind you the temp outside was 30 degrees.

I get out, check the car. No coolant loss...i got under the car and there was no wet leaks anywhere...the overflow tank is completely full and not really hot. no boiling water. Basically no sign that the car was actually over heating.

I get back in, and start it up and the temp reads normal. Now my thought is possibly a bad thermostat but the car has 42k miles and this is the first time this has happened...
Hi leemanfor,

I recommend making an appointment at your dealership so they can take a look. They'll be your best bet for getting an accurate, prompt diagnosis. Keep us posted on how things progress; if you need my assistance, I'll be here!

Crystal
__________________
FORD SERVICE

p: 800.392.FORD
t: @FordService @FordFocus @Ford
f: facebook.com/FordServiceUS facebook.com/FordFocus

M - F 11 a.m. - 8 p.m. ET | Send a PM? Pls allow 2 business days for reply
FordService is online now  
    Reply With Quote Quick reply to this message
Old 03-22-2013, 03:18 PM   #6
leemanfor
Focus Rookie
 
Join Date: Jun 2012
Fan#: 100464
Location: Aurora, CO
What I Drive: 2008 Cobalt SS/Turbo

Posts: 10
FF Reputation: 1 leemanfor Good Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by FordCustomerService View Post
Hi leemanfor,

I recommend making an appointment at your dealership so they can take a look. They'll be your best bet for getting an accurate, prompt diagnosis. Keep us posted on how things progress; if you need my assistance, I'll be here!

Crystal
Thanks Crystal
leemanfor is offline  
    Reply With Quote Quick reply to this message
Old 03-22-2013, 03:19 PM   #7
leemanfor
Focus Rookie
 
Join Date: Jun 2012
Fan#: 100464
Location: Aurora, CO
What I Drive: 2008 Cobalt SS/Turbo

Posts: 10
FF Reputation: 1 leemanfor Good Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by bile0026 View Post
Not quite. The way the sensor is designed it won't read air at all which I think makes it jump to H so that if there was no coolant in the radiator you would know. Liquid temp sensors only work in liquid, they can't read air temps.
ok. I think i need to see if there is a bubble in there like you said.
leemanfor is offline  
    Reply With Quote Quick reply to this message
Old 03-22-2013, 10:04 PM   #8
amc49
Focus Fanatic
 
Join Date: Mar 2012
Fan#: 96610
Location: Fort Worth, TX
What I Drive: 00 wagon, 02 sedan both zetec atx

Posts: 5,066
Points 2,941, Level 33
Points: 2,941, Level: 33 Points: 2,941, Level: 33 Points: 2,941, Level: 33
Level Up 28% Completed
Level up: 28% Level up: 28% Level up: 28%
Forum Activity 41%
Activity: 41% Activity: 41% Activity: 41%
FF Reputation: 23 amc49 Great Standing Member
Buy-Sell-Trade Rating: (0)
Having trouble with some of this. Every water covered sensor I've ever seen for 50 years will not read if no water around the sensor. It shows low not high. Think it out, air does not conduct temp like fluid does. The sensor itself has no way of knowing whether it is covered with fluid and can only reflect temp around it, again, if air then no temp since air carries temperature much slower because not as dense as water. Also, cooling systems are under pressure, they cannot suck air except under very rare and specialized circumstances. I haven't seen a car EVER suck air and have worked on hundreds. Even a pinhole leak will spit fluid rather than suck air, only way to suck air is to be out of coolant anyway, once pump hits the airpocket it ceases to suck. meaning you have to lose much coolant before you can ever suck air. These systems are set up to quickly and fully bleed air into reservoir tanks all the time and keep it there only so you can see it, something is wrong if it is not doing that. I have two Focus and NEVER bleed the cooling systems, they are already done by the time the stat first opens.
amc49 is online now  
    Reply With Quote Quick reply to this message
Old 03-23-2013, 12:20 AM   #9
leemanfor
Focus Rookie
 
Join Date: Jun 2012
Fan#: 100464
Location: Aurora, CO
What I Drive: 2008 Cobalt SS/Turbo

Posts: 10
FF Reputation: 1 leemanfor Good Standing Member
Buy-Sell-Trade Rating: (0)
Well see thats what I dont understand...the car was not overheating. Ive overheated a couple cars and steam blows out and usually the overflow tank is boiling.

nothing even seemed remotely out of place. The motor wasn't extremely hot, the overflow tank was full and at "Hot" on the meter and the radiator wasn't even hot. maybe it was just a sensor issue, cause the car runs fine since
leemanfor is offline  
    Reply With Quote Quick reply to this message
Old 03-23-2013, 12:35 AM   #10
mikebontoft
Derpy Cheetah
 
mikebontoft's Avatar
 
Join Date: Aug 2008
Fan#: 58647
Location: SLC, UT
What I Drive: 5.9L Grand Cherokee ZJ

Posts: 26,128
Points 23,324, Level 93
Points: 23,324, Level: 93 Points: 23,324, Level: 93 Points: 23,324, Level: 93
Level Up 98% Completed
Level up: 98% Level up: 98% Level up: 98%
Forum Activity 17%
Activity: 17% Activity: 17% Activity: 17%
FF Reputation: 76 mikebontoft Excellent Standing Member
Buy-Sell-Trade Rating: (3)
Gauges lie. That's all I can say. Keep an eye on it though. You may end up having a faulty sensor.

What is this talk of sensors "not reading?" A thermistor is a thermistor, with the exception of having a positive or negative coefficient. GM has used the same sensor for both coolant temp and intake temp on MANY vehicles.
__________________
SR #127 | '02 Focus SE "Foci" (5.0 RWD - parting) | '90 Mazda 626 GT "Greenie" (2.2L turbo T3/T4 rebuild-sold) | '75 BMW 2002 "Carby" (resto-mod racecar) | '75 BMW 2002 (donor -sold) | '98 Jeep Grand Cherokee 5.9L (lifted and fast) | '99 BMW 328is (alt. daily).
Moderating General Chat Lounge, General Technical Chat, Ford Focus & General Car Chat, and Rocky Mountain Fanatics
mikebontoft is offline  
    Reply With Quote Quick reply to this message
Reply

Bookmarks & Social Networks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Focus Forum, Ford Focus ST Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 11:20 AM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Terms of Use : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Acura TLX or Fiesta ST. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area.