1989 F150 A/C problems
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Junior User
Joined: May 2006
Posts: 55
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From: Finland,Europe
1989 F150 A/C problems
Hi.
I have a ´89 F150 with 4.9l+M5OD and it has a A/C but it doesn´t work.
Any ideas where i should start looking?
Compressor clutch wont do anything when i turn A/C on,is that something what i should check first?
Tommi
I have a ´89 F150 with 4.9l+M5OD and it has a A/C but it doesn´t work.
Any ideas where i should start looking?
Compressor clutch wont do anything when i turn A/C on,is that something what i should check first?
Tommi
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
Originally Posted by TommiFIN
Hi.
I have a ´89 F150 with 4.9l+M5OD and it has a A/C but it doesn´t work.
Any ideas where i should start looking?
Compressor clutch wont do anything when i turn A/C on,is that something what i should check first?Tommi
I have a ´89 F150 with 4.9l+M5OD and it has a A/C but it doesn´t work.
Any ideas where i should start looking?
Compressor clutch wont do anything when i turn A/C on,is that something what i should check first?Tommi
The valve is available from Ford. FTE sponsor DIRECTFORDPARTS shows the valve to be $18.67 list price, FTE member price: $10.55.
E1AZ-19B888-B .. A/C Vacuum Selector Valve Assy (Motorcraft YH-380)
Last edited by NumberDummy; May 28, 2007 at 04:18 AM.
Fleet Mechanic
Joined: Feb 2006
Posts: 1,776
Likes: 5
From: Lorain County, Ohio
Here's an easy test:
-Start the truck and turn on the AC.
- Locate the low side cycling switch. It's screwed onto a port on or near the Accumulator, 2 wire connector. Jumper the harness connector with a paper clip or piece of wire. The compressor should engage.
- If so, you are probably low on refrigerant. You just need to fix the leak and service the system.
- If not, there is an electrical problem. You'll need to get out the test lighr and start tracing the circuit.
-Start the truck and turn on the AC.
- Locate the low side cycling switch. It's screwed onto a port on or near the Accumulator, 2 wire connector. Jumper the harness connector with a paper clip or piece of wire. The compressor should engage.
- If so, you are probably low on refrigerant. You just need to fix the leak and service the system.
- If not, there is an electrical problem. You'll need to get out the test lighr and start tracing the circuit.
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Junior User
Joined: May 2006
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From: Finland,Europe
Hi guys. Thanks for answers.
I´d like to test what would be the problem so i do that first before i order new parts. But its good to know that there is this "Air Conditioning Vacuum Selector Valve Assy" thingy that is one possibility.
lsrx101 wrote:
"Locate the low side cycling switch. It's screwed onto a port on or near the Accumulator, 2 wire connector. Jumper the harness connector with a paper clip or piece of wire. The compressor should engage."
Now i do need help. What is "low side cycling switch"? And what is "accumulator" also? Any pics or something?
Thanks,Tommi
I´d like to test what would be the problem so i do that first before i order new parts. But its good to know that there is this "Air Conditioning Vacuum Selector Valve Assy" thingy that is one possibility.
lsrx101 wrote:
"Locate the low side cycling switch. It's screwed onto a port on or near the Accumulator, 2 wire connector. Jumper the harness connector with a paper clip or piece of wire. The compressor should engage."
Now i do need help.
What is "low side cycling switch"? And what is "accumulator" also? Any pics or something?Thanks,Tommi
Fleet Mechanic
Joined: Feb 2006
Posts: 1,776
Likes: 5
From: Lorain County, Ohio
The accumulator is the metal "can" mounted to the firewall on the right side. If you follow the fat hose on the compressor, the accumulator is on the other end.
The low side cycling switch is screwed to a port on the accumulator. It's a pressure sensing switch that cycles the compressor to maintain pressure in the evaporator.
- Accumulator- http://tinyurl.com/2gmac4
-Switch- http://tinyurl.com/2ff6df
The low side cycling switch is screwed to a port on the accumulator. It's a pressure sensing switch that cycles the compressor to maintain pressure in the evaporator.
- Accumulator- http://tinyurl.com/2gmac4
-Switch- http://tinyurl.com/2ff6df
Fleet Mechanic
Joined: Feb 2006
Posts: 1,776
Likes: 5
From: Lorain County, Ohio
Originally Posted by TommiFIN
I tried that paper clip method and it did engage.
What should i do next?
Tommi
What should i do next?
Tommi
Also look for oily dirt on the compressor clutch and the compressor body. If there is any sign of leakage around the compressor, you will need a new one.
Being an 89, this will be an R-12 system. If you can get R12, it's best to stay with that. You can also convert to R-134a with a little work. Lets find your leak first, then decide which way to go.
Do you have access to a vacuum pump and a manifold gauge set? You will need these if you want to service the refrigerant system. If not, you can do the repairs yourself and have a shop evacuate and recharge the system.
I just noticed you are in Finland. What refrigerants are available to you there. I know R12 and R134a have been banned in some parts of Europe but I don't know the particulars. How is parts availability for your truck?
Last edited by lsrx101; May 30, 2007 at 05:45 PM.
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Junior User
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From: Finland,Europe
I was told that its illegal to sell R-12 here in Finland also and they are selling R-134a nowadays.
Some guy also told that its possible to use Isceon 49 R-413A refrigerant and it wont need any modifications on my A/C system. Have you heard of this?
I´m still wondering why my magnetic clutch isn´t engaging when my engine is running. It´s just because i used to have ´86 Country Squire and it was low on refrigerant and it was engaging the clutch all the time,several times per minute but my truck wont do anything? Would it be possible that there´s electrical problem as NumberDummy suggested?
Tommi
Some guy also told that its possible to use Isceon 49 R-413A refrigerant and it wont need any modifications on my A/C system. Have you heard of this?
I´m still wondering why my magnetic clutch isn´t engaging when my engine is running. It´s just because i used to have ´86 Country Squire and it was low on refrigerant and it was engaging the clutch all the time,several times per minute but my truck wont do anything? Would it be possible that there´s electrical problem as NumberDummy suggested?
Tommi
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Fleet Mechanic
Joined: Feb 2006
Posts: 1,776
Likes: 5
From: Lorain County, Ohio
Originally Posted by TommiFIN
I was told that its illegal to sell R-12 here in Finland also and they are selling R-134a nowadays.
Some guy also told that its possible to use Isceon 49 R-413A refrigerant and it wont need any modifications on my A/C system. Have you heard of this?
I´m still wondering why my magnetic clutch isn´t engaging when my engine is running. It´s just because i used to have ´86 Country Squire and it was low on refrigerant and it was engaging the clutch all the time,several times per minute but my truck wont do anything? Would it be possible that there´s electrical problem as NumberDummy suggested?
Tommi
Some guy also told that its possible to use Isceon 49 R-413A refrigerant and it wont need any modifications on my A/C system. Have you heard of this?
I´m still wondering why my magnetic clutch isn´t engaging when my engine is running. It´s just because i used to have ´86 Country Squire and it was low on refrigerant and it was engaging the clutch all the time,several times per minute but my truck wont do anything? Would it be possible that there´s electrical problem as NumberDummy suggested?
Tommi
The system is so low on refrigerant that the low side pressure switch isn't closing to engage the compressor. Your 86 had a little bit more static pressure in the system, that's all. The "paper clip" test proved out the electrical part of the system.
Your next step is to check for leaks. As I said earlier, look for oily residue on the lines, fittings and compressor. Start at the compressor and follow the lines to the condenser, to the evaporator and accumulator then back to the compressor. Also look for physical damage to the rubber hoses and corrosion on the metal lines. Let me know what you find.
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Junior User
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From: Finland,Europe
Hi.
Today I checked every hose and fitting but I could not find any damp spots or anything.
I´ll go to A/C specialist and have it pressure tested and maybe that way I´ll find where it leaks.
Thanks again,i´ll get back on this when I have more information.
Tommi
Today I checked every hose and fitting but I could not find any damp spots or anything.
I´ll go to A/C specialist and have it pressure tested and maybe that way I´ll find where it leaks.
Thanks again,i´ll get back on this when I have more information.
Tommi
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From: Asheville, NC
Its a safety switch to keep you from KILLING your compressor when it is trying to run a system deviod of freon.
I have 3 1980's cars with original compressors. I do my own maintenance. All the units are quiet, and most important, COLD!!!
Bruce
I have 3 1980's cars with original compressors. I do my own maintenance. All the units are quiet, and most important, COLD!!!
Bruce
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1989 f150 302
ok so i just got the A/c on my truck recharged, i had it done by a professional, vacuum and leak tested and what not, every thing was good except it had no freon at all so i couldn't test the compressor, so we recharged it, and it blew somewhat cold, everything seemed to work. i ran it for a while, but its definitely not blowing as cold as it should.
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