Heater / AC controls
Thread Starter
|
Elder User
Joined: Feb 2004
Posts: 830
Likes: 0
From: Indiana
Heater / AC controls
My 82 F100 truck has good heat but no A/C. The temp control cable works good and adjust the temp. The lower control arm does nothing but turn off the blower in the off postion. Any other postion ( A/C, heat defrost, floor ) functions does nothing. The air only comes out of the defrost vent on the passenger side. The control has vacuum going to it and it has vacumm going to the switch.
Does this sound like I need to replace the control unit? I replaced the heater core today and cleaned out the housing. The truck had sit for quite a while and had mice living in it.
I'm going to the salvage yard this weekend and was going to pick one up.
Does this sound like I need to replace the control unit? I replaced the heater core today and cleaned out the housing. The truck had sit for quite a while and had mice living in it.
I'm going to the salvage yard this weekend and was going to pick one up.
Senior User
Joined: May 2008
Posts: 202
Likes: 0
From: Bentonville, AR
Sounds like you may have a vaccuum hose disconnected. Mine did the same thing. There is a control thing that is behind the dash toward the passenger side next to the radio.
While cleaning out my dash I disconnected thos that goes on the driver's side of the control...reconnected it and all worked fine.
While cleaning out my dash I disconnected thos that goes on the driver's side of the control...reconnected it and all worked fine.
Thread Starter
|
Elder User
Joined: Feb 2004
Posts: 830
Likes: 0
From: Indiana
I know everything is connected. I just put in a new heater core and made sure everything was hooked back up.
How much vacuum should be going to the under dash controls. I'll try and measure how much is actually going to the controls and post it.
How much vacuum should be going to the under dash controls. I'll try and measure how much is actually going to the controls and post it.
Thread Starter
|
Elder User
Joined: Feb 2004
Posts: 830
Likes: 0
From: Indiana
I got it figured out. The vacuum hose was broke were it goes into the A/C housing. Fixed it with a piece of rubber vacuum hose. Everything works now execpt the A/C won't kick on. No voltage to the A/C pump. Have to look into that later. At least all the other control functions work.
Thread Starter
|
Elder User
Joined: Feb 2004
Posts: 830
Likes: 0
From: Indiana
Thanks Franklin and Timcos for the help.
I didn't think about the freon being low. I'll try that and see if that works. The truck sat for a long time before I got it. I'm sure the orings in the A/C system are probably shot too. My brother has a vacuum pump for A/C systems he said he could check and see if it had any leaks. Sounds like a summer project.
I didn't think about the freon being low. I'll try that and see if that works. The truck sat for a long time before I got it. I'm sure the orings in the A/C system are probably shot too. My brother has a vacuum pump for A/C systems he said he could check and see if it had any leaks. Sounds like a summer project.
Trending Topics
Thread Starter
|
Elder User
Joined: Feb 2004
Posts: 830
Likes: 0
From: Indiana
You were right on the money Franklin. I put a jumper across the connector for the accumaltor and the compressor locked in and started running.
How hard is it to convert to R134? It will be spring before I'd want to do it. Won't need it till then.
How hard is it to convert to R134? It will be spring before I'd want to do it. Won't need it till then.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
