Hello everyone,
My '70 F100 is running under tempurature. It never warms to operating temperature, and hasn't since I have owned it (3 months). I replaced the thermostat, rebuilt the carburetor, replaced the choke thermostat and pulloff. The heater works great and it has plenty of coolant in it.
No matter how long I drive it seems there is not enough heat to expand the choke thermostat and open the choke plate completely. I have had to manually open the choke just to drive it when it gets warm-ish. I have tweeked and adjusted the choke thermostat a dozen times.
Any thoughts on how to remedy this? I am open to ideas on how to get some hot air into the choke thermostat housing just to make it run right, but I also want to figure out why it doesn't get up to temp.
Presently in the stable
1969 Ford F-350 DRW
1989 Chevy S-10 Tahoe ( It gets me to work and back and fetches parts and groceries)
1981 Buick Regal ( My deceased uncles last project/driver....renamed project Regal Eagle to be finished in his honor)
1990 Ford F-150 ( Miss Yvonnes Daily Driver )
My F-350 project http://www.fordification.com/forum/view ... 22&t=41744
The heat tubes were both rotted out and disconnected. I tacked them in place but they are not sealed. do these need vacuum? if so, that is probably my issue.
I think the more important thing to find out first would be whether the tubes are clogged or not. Either from exhaust carbon build up.... a kink in the line...rust.....or even possibly from tack welds. There is a thread on here somewhere that tells about replacing the entire lines.
Presently in the stable
1969 Ford F-350 DRW
1989 Chevy S-10 Tahoe ( It gets me to work and back and fetches parts and groceries)
1981 Buick Regal ( My deceased uncles last project/driver....renamed project Regal Eagle to be finished in his honor)
1990 Ford F-150 ( Miss Yvonnes Daily Driver )
My F-350 project http://www.fordification.com/forum/view ... 22&t=41744
originally those tubes slip into the exhaust manifold. if they are rotted off. drill out the manifold to clear it of the old tube. then push the good clean end back in the manifold. if they are clogged heat wotn really get up in them. the choke has to be set correctly also for it too work properly.
Get a 3 foot section of 3/16" brake line, bend it in half without pinching the bend, then bend an L in it so you cna put two or three hose clamps to hold it to the manifold. Bend the ends so they go to the carb. One side goes to the air horn, the other through the element spring and should have vacuum on it. If not remove the choke assy and check for vacuum at the port. Clear the blockages and it should be adjustable from there. Pretty simple fix for around $20.
After some research I discovered that Ford switched to an electric choke thermostat in 1974 in the Autolite 2100. I bought one and it fits and works perfectly. This seems a good alternative to trying to fix the tubing on this thing. I am not a purist and don't need it to be original. The electric choke thermostat is a good fix for me and cost about the same as replacing the steel tubing anyway.
After some research I discovered that Ford switched to an electric choke thermostat in 1974 in the Autolite 2100. I bought one and it fits and works perfectly. This seems a good alternative to trying to fix the tubing on this thing. I am not a purist and don't need it to be original. The electric choke thermostat is a good fix for me and cost about the same as replacing the steel tubing anyway.
thanks for your help!
You have any part numbers on that? I would like to do same. Where did you get the power for it?
Steve
1970 F350 DRW Factory 9' Platform/Stake, 360, T18.
Passed on to new care taker July, 2013
It runs right and warms up fine. I just want to use an electric choke.
as for power for electric choke, best is one of the teminals on the alternator(don't remember which) but you can check with a test light. I gives voltage only when running. But sureto put a fuse in line.
I was replying to his original question
jamesobryan wrote:Hello everyone,
My '70 F100 is running under tempurature. It never warms to operating temperature, , but I also want to figure out why it doesn't get up to temp.
Do you have an after market temperature gauge on the truck? You say the heater works fine so are you sure the what temp. the engine is getting to? Just because the choke doesn't open doesn't mean the engine isn't getting up to proper temp. is what I am trying to say.
Have you adjusted the choke at all? Have you made sure all of the linkages on the choke are right and not frozen up?
clint
