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Old 11-16-2014, 07:39 PM   #1
Vision1961
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Smile No cabin temperature...

So after a full hose check, rad flush and new coolant, I can get at best 'warm air' into the passenger cabin - which with -5 already and -40's around the corner is not good.

The engine is producing good heat, everything seems to be flowing as it should but none of that lovely heat is getting into the cabin.

As an aside, last winter we thought the fan speed resistor had quit as only the high speed setting would work, so we bought another one, installed it, switched it on - all 4 speed settings worked fine for the first 3 days after which - same as before only the high speed working. If the one fan speed is working - what is causing the others not to work?


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Old 11-16-2014, 07:45 PM   #2
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The first item with not enough heat may be your blend door. It may not be opening. You will have to check the cables and see if it is operating the door.

The second problem with the blower is your bearings. They need to be lubed or the blower will ruin the resistor block by drawing too much current.
http://www.focusfanatics.com/forum/showthread.php?t=245260
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Old 11-16-2014, 07:53 PM   #3
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Where/what is the blend door please? Thanks for the blower link.
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Old 11-16-2014, 08:35 PM   #4
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The blend door is operated by the temperature selector. By turning the selector back and forth, you should hear the door opening and closing. The Focus does not have a heater valve like some cars...the door is used to simply allow air to flow through the heater core or not, or partially depending on the selection.
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Old 11-17-2014, 02:00 AM   #5
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There is also an a/c bypass door that if open will do same thing, it has to be the opposite or closed to work. So, two doors there. That a/c one is exposed when the glovebox is opened then fully dropped to dump its' contents on the floor. Look at blower and the small slits in box there, the slits should have the door behind them blocking the slits from passing air, if the slits open up into deeper area the door is still open and needs shutting. The shaft to that one is known for stripping to not work, you can make a hook out of coat hanger to reach inside slot to pull door back down closed.
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Old 11-17-2014, 02:01 AM   #6
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The blower switch as well can fail to give only high speed, happened to mine.
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Old 11-17-2014, 09:06 AM   #7
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This stickie has a lot of info on the doors & their cable controls for your model:http://www.focusfanatics.com/forum/showthread.php?t=302320
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Old 11-17-2014, 09:15 AM   #8
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"....worked fine for the first 3 days after which - same as before only the high speed working"

Your new resistor block has probably been ruined. You can check it with an ohmmeter. See if there is continuity between pin 1 and the other three pins. If there is no continuity the thermal fuse has been blown due to the dragging fan bearings.

A schematic of the fan circuit is in this thread:
http://www.focusfanatics.com/forum/showthread.php?t=329049

Speed 4 bypasses the resistor block and will continue to work even if the block is bad.

Be sure and check for junk (leaves and other trash) behind the evaporator coil while you have the blower motor out. Ford did not put a cabin filter in at the factory...just a placeholder for one under the cowling.
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Old 11-17-2014, 09:25 PM   #9
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@Focusknot: Blender door working fine, air gets redirected appropriate to selector setting.
@amc49 - will check this out for sure, as it happens the ac hasn't worked since 2012 when we went to get it fix only to find 'something' wasn't available anymore so we left it empty of freon and disconnected.As to resistor blocks and speed switches not working - both being electrical makes 'em beyond me, if either is the issue - it'll have to stay that way!
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Old 11-18-2014, 08:44 AM   #10
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Quote:
Originally Posted by Vision1961 View Post
Blender door working fine, air gets redirected appropriate to selector setting.
That is good news! If it was not working the repair could range from very simple all the way to having to tear the entire dash apart. Now to check the A/C bypass door per AMC's post.

Quote:
Originally Posted by Vision1961 View Post
As to resistor blocks and speed switches not working - both being electrical makes 'em beyond me, if either is the issue - it'll have to stay that way!
I understand. Troubleshooting electrical is difficult for many. However, you could turn this into just a mechanical repair by replacing the blower fan and resistor block.

If you don't replace the fan I predict additional problems will develop with it. As the fan bearings continue to dry out and the fan struggles more and more to run, it will eventually start blowing the fuse. Hopefully it won't burn any wiring. So, either make the repairs now or expect for it to stop running in the near future.

Cheers!
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