*NOW BOOKED FOR 2024* Transitmania 15 @ Santa Pod 19th to 21st July 2024 *ALL DETAILS HERE*


Air Con/Blower issue

Transit Mk6 & Mk7 Forum. All Transits 2000 - 2013

Air Con/Blower issue

Postby transithead » Sun Apr 22, 2018 7:37 am

Hello,

Firstly I want to say I really appriciate peoples replies. I think this forum is a great place for information. 8)

I have a 2008 Mk7 Transit T260. I recently purchsed it with a few minor issues I sorted out. Like Horn not working (Missing fuse)

It has an issue with the air conditioning. When I press the A/C button in there is no green light on it and it does not seem to do anything. Also the blower is hot all the time and doesn't seem to want to blow cold air. Someone has fitted an inline switch for some reason so the blower is on or off. Seems as in the past someone has had an issue with not being able to turn the blower off.....


Please help me and i'll buy you a beer. If we ever meet. :D :) :mrgreen:
User avatar
transithead
Transit Fan
Transit Fan
 
Posts: 13
Joined: Sun Apr 22, 2018 6:49 am

Re: Air Con/Blower issue

Postby tilly » Mon Apr 23, 2018 12:05 pm

Have you checked the fuse, and does the secondary (small) fan operate, near the radiator.
Mk7, FWD 110ps GLX in Silver 2007
tilly
Transit Aficionado
Transit Aficionado
 
Posts: 258
Joined: Sun Dec 21, 2008 1:33 pm

Re: Air Con/Blower issue

Postby v8dave » Mon Apr 23, 2018 6:26 pm

If the original ford blower switch does not work and a separate switch has been added then it is likely that all the wiring has been disconnected from the original blower switch.
This switch does both the blower and the a/c.
Fix the blower switch issue first then you can see if the a/c functions.

The heat control or lack of could be a failed control or actuator, the knob is an electrical control connected to a electrical actuator on the heater.
You might need a new control but the actuator seems to be the more common source of problems.

Don't worry about the a/c cooling fan on the radiator until you've got the blower and heat controls working properly.
mk7 08reg 2.4 T350 LWB MHR RWD
mk6 X reg 2.4 T350 LWB MHR RWD - scrapped
mk4 J reg 2.5 L300 LWB MHR RWD - sold on

Notice a trend there ? not too big and not too small
User avatar
v8dave
Transit Fanatic
Transit Fanatic
 
Posts: 3417
Joined: Sun Jan 24, 2010 10:23 pm
Location: Home counties

Re: Air Con/Blower issue

Postby transithead » Thu Apr 26, 2018 5:41 pm

When u turn the hot and cold knob is it meant to turn something inside that acrivates a switch? Because i can see a teardrop shaped peice of plastic resting against a switch down on the drivers side above the clutch pedal which does not move at all when i turn the hot and cold knob. The one below it does move when i turn the knob to windscreen
User avatar
transithead
Transit Fan
Transit Fan
 
Posts: 13
Joined: Sun Apr 22, 2018 6:49 am

Re: Air Con/Blower issue

Postby v8dave » Thu Apr 26, 2018 6:29 pm

The connection between the heat control knob and the heat valve is purely electrical, it is actually a potential divider that sets the position of a servo motor on the heat control flap in the heater housing.

Both the a/c on/off switch and the heat control get their power from fuse 39 in the first fuse box behind the glovebox.
mk7 08reg 2.4 T350 LWB MHR RWD
mk6 X reg 2.4 T350 LWB MHR RWD - scrapped
mk4 J reg 2.5 L300 LWB MHR RWD - sold on

Notice a trend there ? not too big and not too small
User avatar
v8dave
Transit Fanatic
Transit Fanatic
 
Posts: 3417
Joined: Sun Jan 24, 2010 10:23 pm
Location: Home counties

Re: Air Con/Blower issue

Postby transithead » Thu Apr 26, 2018 9:04 pm

Fuse is ok. Seems there is no power going to the AC button to me
User avatar
transithead
Transit Fan
Transit Fan
 
Posts: 13
Joined: Sun Apr 22, 2018 6:49 am

Re: Air Con/Blower issue

Postby v8dave » Thu Apr 26, 2018 9:24 pm

v8dave wrote:If the original ford blower switch does not work and a separate switch has been added then it is likely that all the wiring has been disconnected from the original blower switch.
This switch does both the blower and the a/c.

Have you checked that there is both an electrical plug and a pnuematic plug connected to the blower switch ?

If it is unplugged or the wiring modified then that might be the problem.

Could also be there is no gas left in the a/c system. The low pressure switch will shut it down.
mk7 08reg 2.4 T350 LWB MHR RWD
mk6 X reg 2.4 T350 LWB MHR RWD - scrapped
mk4 J reg 2.5 L300 LWB MHR RWD - sold on

Notice a trend there ? not too big and not too small
User avatar
v8dave
Transit Fanatic
Transit Fanatic
 
Posts: 3417
Joined: Sun Jan 24, 2010 10:23 pm
Location: Home counties

Re: Air Con/Blower issue

Postby transithead » Thu Apr 26, 2018 10:14 pm

I am with you. But surly the green light will still come on? There are two electrical plugs going into it and some weird plug that when unplugged makes a sucking noise
User avatar
transithead
Transit Fan
Transit Fan
 
Posts: 13
Joined: Sun Apr 22, 2018 6:49 am

Re: Air Con/Blower issue

Postby the dutch guy » Fri Apr 27, 2018 5:54 pm

That weird sucking is the vacuum line to the recirc flap. Dont disconnect that thing, you lose vacuum making for all sorts of troubles, not having powered brakes for starters...
Mk6 SWB TDCI 125
the dutch guy
Transit Aficionado
Transit Aficionado
 
Posts: 494
Joined: Sun Jul 09, 2017 12:22 am

Re: Air Con/Blower issue

Postby v8dave » Fri Apr 27, 2018 6:14 pm

transithead wrote:I am with you. But surly the green light will still come on? There are two electrical plugs going into it and some weird plug that when unplugged makes a sucking noise

The heater blower circuit runs as follows.

Power from fuse box goes to blower motor.
Earth of blower motor goes to speed control resistor pack in blower housing.
Three earths from resistor pack go to blower speed switch.
Switch earths one of the three lines from the resistor pack, this gives the three speeds. The off position earths none of them.
Earth of switch goes through wires and chassis to battery negative.

The blower switch earth is also the earth for the a/c led.

The a/c is turned on and off by the engine management. This can be enabled by either pushing the blower switch or selecting the screen demist position on the air direction control.

If someone has modified the wiring then the earth from the blower switch may be severed.
This would stop the green light and the a/c from coming on.
Warning: there may be other faults, like no gas, stopping the a/c from functioning.
mk7 08reg 2.4 T350 LWB MHR RWD
mk6 X reg 2.4 T350 LWB MHR RWD - scrapped
mk4 J reg 2.5 L300 LWB MHR RWD - sold on

Notice a trend there ? not too big and not too small
User avatar
v8dave
Transit Fanatic
Transit Fanatic
 
Posts: 3417
Joined: Sun Jan 24, 2010 10:23 pm
Location: Home counties


Return to Mk6 & Mk7 - Third Generation Transits



Who is online

Users browsing this forum: Google [Bot]

This site contains affiliate links for which we may be compensated.