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cbass139
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Group: Forum Members
Last Active: 12 Years Ago
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After putting the PCV system in and getting everything buttoned up and all the leaks (air) worked out I drove the truck to work this morning and it was running hot on the gauge. I have access to a thermo imaging camera with heat sensor but what I want to know is were to aim it to get the reading? At the cylinder head, at the block, at the thermostat housing, at the radiator? Also I have a 180 thermostat in the truck and it is pretty stinking hot here in chicago should the temp be at that 180 or is 190/200/220 acceptable? Thanks in advance Sebastian
1958 F100 292"Nothing is particularly hard if you divide it into small jobs." "Chop your own wood, and it will warm you twice." -Henry Ford
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charliemccraney
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Group: Moderators
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The thermostat temperature can be considered the minimum temperature once it is up to temp. If you're cruising, I'd expect it to remain fairly close to the thermostat rating. If you're in traffic, it's not unreasonable for it to be higher. If it's not boiling over, it shouldn't be a problem. Aim the sensor at the thermostat housing.
Lawrenceville, GA
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cbass139
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Group: Forum Members
Last Active: 12 Years Ago
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Yeah, got it thanks. The only reason I worry is that the gauge would be rock steady in the middle before I did the PCV work and when I had the intake off I also changed the thermostat because I had access at the time, now I am worried that I should have left well enough alone. It is now reading 3/4 on the Hot side of the gauge. Thanks, will check the temp tonight. Sebastian
1958 F100 292"Nothing is particularly hard if you divide it into small jobs." "Chop your own wood, and it will warm you twice." -Henry Ford
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charliemccraney
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Was the old thermostat also 180 and was it functioning correctly? Check your coolant level. Sometimes an air pocket can prevent the engine from filling completely. After a few drives it may remedy itself but the level may then be low.
Lawrenceville, GA
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GREENBIRD56
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I usually use my instruments to check temp at the thermostat housing. Any differences between the old thermostat and the new one? Temp rating - poppet size - that sort of thing...? The water temp usually rises to some sort of equilibrium based on the cooling capacity of the system and the outdoor temperature. If the old thermostat flowed more water than the new one - temp could go up. Charlie is right on about the 'boil-over" - if you aren't boiling over, its usually OK. What pressure rating is the cap? 
Most guys choose to run the cap that works best for the circumstances - new, strong clean radiator can handle a higher pressure cap. Old outfit may run OK with a lower cap rating - and still work fine. Raised outfdoor temp, higher loads, greater elevation - that sort of thing - might make you want to have a higher cap rating to increase your margin over the boil-over point.
Steve Metzger Tucson, Arizona
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cbass139
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Group: Forum Members
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I have the 15 lb cap, thanks for that info. I ran her up to temp again and it went to that 3/4 point on the gauge, I took the thermal imaging camera and aimed it at the thermostat housing and got right around 160 but could see that the stat had opened because the tube was the same temp. I grabbed it and it was nice and hot but I also pointed it at the lower hose to the pump it was around 85 degrees and I grab it and it was cool to the touch. Do you think that the water pump is not working? Or is that normal? Thanks for the help, as usual I need it. Regards Sebastian
1958 F100 292"Nothing is particularly hard if you divide it into small jobs." "Chop your own wood, and it will warm you twice." -Henry Ford
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pegleg
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The lower hose is supposed to be cool. That's water FROM the radiator. Pump is fine, the 85 is really very cold, you must have just started it, normally I'd expect that to be 140 or 150 in 90 degree weather like we had earlier today.
Frank/RebopBristol, In ( by Elkhart) 
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cbass139
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Group: Forum Members
Last Active: 12 Years Ago
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I probably could have let it run longer but I just wanted to see what was going on and most of all that the thermostat was opening. It is not boiling over, just dont get why the gauge has changed on me. Is it possible that the PCV valve pulling fumes to the area of the block that the sensor is could have it reading a little higher? Any ideas? Sebastian
1958 F100 292"Nothing is particularly hard if you divide it into small jobs." "Chop your own wood, and it will warm you twice." -Henry Ford
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GREENBIRD56
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It could be that you just distrurbed the wiring.... 
Steve Metzger Tucson, Arizona
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cbass139
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Group: Forum Members
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is there a fix for that, would like to have that needle in the middle so I can see the fluctuation a little better.
1958 F100 292"Nothing is particularly hard if you divide it into small jobs." "Chop your own wood, and it will warm you twice." -Henry Ford
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