Heater / AC / fan
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Junior User
Joined: Oct 2015
Posts: 69
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From: Eastern WA. St.
Heater / AC / fan
New guy here , I have a 2006 F-150 XL with 145,900 miles , about a year ago
the AC / heater temp. control would not regulate from cold to hot , just would
stay hot in AC and heater mode . I had a guy look at the blend door motor and
it was working at the time ( he said it was was working but it was slow )
also looked to see and hear the compressor clutch did engage / dis-engage
as the temp. control was rotated from cold to hot and back again . Then about
two months ago had another person tell me that the AC system needed to
be serviced . He told me that was the reason it was blowing hot air only .
( low on freon ? )
Problem number two ; The blower fan stopped working in all speeds after I disconnected / re-connected the battery when I changed a COP on #5 .
I'm confused as to which fuse is the particular one for the fan motor , the
owners guide fuse chart shows two ( fuse; 30 amp cartridge / full ISO relay)
Any thoughts, ideas , or input would be greatly appreciated , Thanks , Kris
the AC / heater temp. control would not regulate from cold to hot , just would
stay hot in AC and heater mode . I had a guy look at the blend door motor and
it was working at the time ( he said it was was working but it was slow )
also looked to see and hear the compressor clutch did engage / dis-engage
as the temp. control was rotated from cold to hot and back again . Then about
two months ago had another person tell me that the AC system needed to
be serviced . He told me that was the reason it was blowing hot air only .
( low on freon ? )
Problem number two ; The blower fan stopped working in all speeds after I disconnected / re-connected the battery when I changed a COP on #5 .
I'm confused as to which fuse is the particular one for the fan motor , the
owners guide fuse chart shows two ( fuse; 30 amp cartridge / full ISO relay)
Any thoughts, ideas , or input would be greatly appreciated , Thanks , Kris
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
you need to check both fuses to see that power is available on the output side.
Your "AC" guy can have an opinion on needing to be serviced, but you need the HI and LO side pressures on the system to determine what really needs to be done. If the compressor is running most of the time, then the pressure is not too far off, but could be slightly low.
Your "AC" guy can have an opinion on needing to be serviced, but you need the HI and LO side pressures on the system to determine what really needs to be done. If the compressor is running most of the time, then the pressure is not too far off, but could be slightly low.
Hotshot
Joined: Jan 2004
Posts: 19,762
Likes: 1,079
From: St Louis
also looked to see and hear the compressor clutch did engage / dis-engage
as the temp. control was rotated from cold to hot and back again .
as the temp. control was rotated from cold to hot and back again .
Then about two months ago had another person tell me that the AC system needed to
be serviced . He told me that was the reason it was blowing hot air only .
( low on freon ? )
be serviced . He told me that was the reason it was blowing hot air only .
( low on freon ? )
Is this a manual or automatic climate control?
Thread Starter
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Junior User
Joined: Oct 2015
Posts: 69
Likes: 0
From: Eastern WA. St.
you need to check both fuses to see that power is available on the output side.
Your "AC" guy can have an opinion on needing to be serviced, but you need the HI and LO side pressures on the system to determine what really needs to be done. If the compressor is running most of the time, then the pressure is not too far off, but could be slightly low.
Your "AC" guy can have an opinion on needing to be serviced, but you need the HI and LO side pressures on the system to determine what really needs to be done. If the compressor is running most of the time, then the pressure is not too far off, but could be slightly low.
look online to learn how to check the relay with a multi meter . Would the
blower motor resistor be suspect ? . Suppose it would be a good idea to check
the fuse panel for power, probably will remove the passenger seat so I can get to the fuse panel in the kick panel , not as agile as I used to be , old back
and knee injuries = arthritis . Does the blend door have any effect on the AC to be hot or cold ? , I thought it only regulates the heater/ defrost temp. ?
Any thoughts what a AC system "check up " should cost ? . Thanks , Kris
Thread Starter
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Junior User
Joined: Oct 2015
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From: Eastern WA. St.
on the AC system cost ?
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
the very very first thing you do is connect two gauges and see what the HI and LO side pressures are. With compressor not running, the pressure will be the same on both sides.. Pressure will normally be about 70 psi on a 70 degree day and 90 psi on a 90 degree day. Start the truck and see that the HI side goes up toward 200 psi and the low side goes down toward 35 psi.. ( these are estimates).. If you have LOW pressures then you might need more refrigerant. If you have HIGH pressures or the compressor will not start, you have bigger problems...
If the compressor runs, you have 200 psi on the high side and 35 psi on the low ( approx.) and the air is WARM or HOT, then feel the lines on the compressor. One is COLD and one is HOT.... if your air is WARM then you are mixing hot and cold air with the blend door / duct.
Blend door puts a portion of the air from the cooling coil thru the heater and "MIX" this works in all air discharge locations ( floor / dash / defrost) .... the "HEAT" **** controls the mix.
If the compressor runs, you have 200 psi on the high side and 35 psi on the low ( approx.) and the air is WARM or HOT, then feel the lines on the compressor. One is COLD and one is HOT.... if your air is WARM then you are mixing hot and cold air with the blend door / duct.
Blend door puts a portion of the air from the cooling coil thru the heater and "MIX" this works in all air discharge locations ( floor / dash / defrost) .... the "HEAT" **** controls the mix.
Hotshot
Joined: Jul 2005
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Likes: 180
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Thread Starter
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Junior User
Joined: Oct 2015
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From: Eastern WA. St.
the very very first thing you do is connect two gauges and see what the HI and LO side pressures are. With compressor not running, the pressure will be the same on both sides.. Pressure will normally be about 70 psi on a 70 degree day and 90 psi on a 90 degree day. Start the truck and see that the HI side goes up toward 200 psi and the low side goes down toward 35 psi.. ( these are estimates).. If you have LOW pressures then you might need more refrigerant. If you have HIGH pressures or the compressor will not start, you have bigger problems...
If the compressor runs, you have 200 psi on the high side and 35 psi on the low ( approx.) and the air is WARM or HOT, then feel the lines on the compressor. One is COLD and one is HOT.... if your air is WARM then you are mixing hot and cold air with the blend door / duct.
Blend door puts a portion of the air from the cooling coil thru the heater and "MIX" this works in all air discharge locations ( floor / dash / defrost) .... the "HEAT" **** controls the mix.
If the compressor runs, you have 200 psi on the high side and 35 psi on the low ( approx.) and the air is WARM or HOT, then feel the lines on the compressor. One is COLD and one is HOT.... if your air is WARM then you are mixing hot and cold air with the blend door / duct.
Blend door puts a portion of the air from the cooling coil thru the heater and "MIX" this works in all air discharge locations ( floor / dash / defrost) .... the "HEAT" **** controls the mix.
any recommendations ? I don't want to buy junk but don't need
top of the line either .
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Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
you can get a cheap set for $50- 75 at Harbor Freight or maybe Auto Zone. You might just stop by the AC shop and have them connect the gauges for 5 minutes and tell you what is going on. Without the number, its only a guess.
Senior User
Joined: Jul 2015
Posts: 106
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From: Lombard Il.
Steve is right on about checking the high and low side. Go for a set of good ones and you won't be sorry. Harbor freight gauges read in Celsius FYI. Go to a heating and a/c supply and get them. They will be around 100.00 and you will need the quick connects also as all of today's vehicles use them. You can also use them on your homes condensing unit and while you are at the heating and a/c joint ask them for a pressure chart for 134a refrigerant (they should be free). your low side should be between 35 and 45 psi and the high side, 140 to 150 psi. These pressures correspond to temps found on the chart. If your readings are zero then you need to get a vacuum pump and evacuate the system before recharging because any air in the system will give a good pressure reading after a recharge but s#$tty cooling. How do I know? I used to do this for a living. Also any fittings you may need for what ever reason go to the heating and a/c supply because the thread sizes and tubing sizes are different than hardware store stuff.
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
for a part time ,weekend guy .......... the Harbor Freight unit is probably adequate. We just need an idea of what he has got...... If he says it reads 40 psi on both sides, not running, that's bad........ If he says it reads 90 psi on both sides, that's good........ When motor started, as you said, if he has 25 psi / 150 psi on a cool day.. that's good....... if he has 35 psi / 200 psi and its 90 degrees outside.. that's good also......... we just need some generic numbers to determine what the problem might be.
Thread Starter
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Junior User
Joined: Oct 2015
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From: Eastern WA. St.
Hi guys , I didn't want to start an argument ... although I'm learning
more and more , and I appreciate everybody's input . I'm going to buy
a set of gauges , but fist thing is first , I need to replace the climate
control module . The fuse and relay are good , have voltage at the fuse
panel , the blower motor resistor was bad so I replaced that , the rotary
switch for the fan ohms out ok , still absolutely no fan / ac in-gauge /
heat / cab air re-circulate when I push the button / buttons for those
functions . So I figure the circuit board is toast . I can't think of what
else it would be ? Thanks , Kris
more and more , and I appreciate everybody's input . I'm going to buy
a set of gauges , but fist thing is first , I need to replace the climate
control module . The fuse and relay are good , have voltage at the fuse
panel , the blower motor resistor was bad so I replaced that , the rotary
switch for the fan ohms out ok , still absolutely no fan / ac in-gauge /
heat / cab air re-circulate when I push the button / buttons for those
functions . So I figure the circuit board is toast . I can't think of what
else it would be ? Thanks , Kris