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  #1  
Old 12-30-2015, 09:54 PM
Coybus Coybus is offline
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Default Lower radiator hose doesn't warm up.

Had a hose blow on my cooling system and temperature gage maxed out causing truck to die. Changed thermostat and it seems to run fine but I noticed the lower radiator hose doesn't get very warm. Is this normal?
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Old 12-30-2015, 10:26 PM
stateranger stateranger is offline
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Default Re: Lower radiator hose doesn't warm up.

Does it get up to normal temperature on the guage? The lower radiator hose is usually quite a bit cooler because the coolant comes in the top and out the bottom cooled by the radiator.
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Old 12-30-2015, 11:00 PM
Krazy-baja Krazy-baja is offline
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Originally Posted by stateranger View Post
Does it get up to normal temperature on the guage? The lower radiator hose is usually quite a bit cooler because the coolant comes in the top and out the bottom cooled by the radiator.
^ right.
If someone reads that could be confused
Out the top of the motor (hot)
In the bottom of motor (cool)

Is the radiator plugged up?
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Old 12-31-2015, 12:47 PM
Coybus Coybus is offline
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Top hose gets hot. On the thermostat where the lower radiator hose connects there is a smaller hose that does get hot. Temp gage shows normal.
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Old 12-31-2015, 02:47 PM
Krazy-baja Krazy-baja is offline
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Radiator could be plugged up. Does the coolant look dirty?
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Old 12-31-2015, 04:06 PM
Coybus Coybus is offline
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No, looks normal. How can you check for plugged radiator?
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Old 01-09-2016, 12:39 PM
GSF1200S GSF1200S is offline
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Default Re: Lower radiator hose doesn't warm up.

Quote:
Originally Posted by Krazy-baja View Post
Radiator could be plugged up. Does the coolant look dirty?
Yup, though usually if this happens cooling performance degrades and youd run into an overheating scenario.
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No, looks normal. How can you check for plugged radiator?
No way to really check for specific "plugs" that I know of.

Do you have an ultragauge, scangauge, or scan tool? It would be a good idea to monitor the temperature with that. I dont know what year your truck is- on the 01-03 rangers with the duratec, an ultragauge/scangauge/scanner will report cylinder head temperature (CHT). On the 04+ rangers, they report coolant temperature (CT). If monitoring CHT, it should be between 240-270 deg F. If CT, it should stay at 190 once warmed up.

I have a pretty much new cooling system in my truck, including a new radiator. Unless Im really really pushing it, my lower radiator hose stays coolish. At most it gets barely warm. This is the function of the radiator and suggests its doing its job great- hot comes in the top and goes through the radiator- by the time it comes to the lower radiator hose, its significantly cooled down. As radiator performance degrades, the lower radiator hose will get warmer and warmer as its not as able to remove the heat. My ultragauge reports CHT, and with the 2006 thermostat mod, I stay in the 235-255 range regardless of driving. If I climb a long hill with load it will creep into the lower 260s, but this isnt cause for concern- ford specs say the CHT should read 255-275. If you have a CT reading, then it should stay at 190 and barely move- the thermostat regulates the coolant temperature at that.

Check your temps with a scanner of some kind and if theyre good, I wouldnt worry about it.
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  #8  
Old 01-11-2016, 07:16 AM
tomw0 tomw0 is offline
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Default Re: Lower radiator hose doesn't warm up.

You can look into the radiator at the ends of the tubes, when the coolant level is lowered.

If it is plugged, you'll likely see the 'stuff' on the ends of the tubes.

The lower hose being cooler is normal. If you cannot hold your hand onto the two (BOTH) hoses feeding the heater core coolant, then the engine is up to temp properly no matter what the lower hose is doing.
The Lima is a pretty cool running engine, and doen't need a lot of heat rejection to the coolant and then to the radiator, so the lower hose will not get real real hot. Normal.
tom
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