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  #1  
Old 01-11-2011, 12:33 PM
Grog Grog is offline
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Default Engine runs cold

85 ranger with 2.3 gas motor. Temp gauge barely comes off cold. No heat available from heater. tryed replacing the thermostat, but it still runs cold. Any ideas?
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  #2  
Old 01-11-2011, 12:38 PM
blkranger231 blkranger231 is offline
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Default Re: Engine runs cold

Clogged/ bad heater core you may need to flush the system.
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  #3  
Old 01-16-2011, 11:21 AM
1KOOL1 1KOOL1 is offline
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Default Re: Engine runs cold

Check the radiator core, If after you run it long enough that it should be warmed up, you have hot & cold spots in the core then the radiator needs to be cleaned or replaced. It will be stopped up. I run across this alot, especially since you've replaced the thermostat.It has nothing to do with the heater core if the guage is reading low. Check the radiator core for hot & cold spots, & let us know the results. Good luck.
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Old 01-16-2011, 11:47 AM
FireRanger FireRanger is offline
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Default Re: Engine runs cold

Its not the heater core if the engine isn't warming up at all. Also, a clogged radiator would be causing overheating, not underheating.

On a cold engine, is the radiator full and the reserve tanker 1/2 full? If not, add coolant.

After the engine has been running and should be hot, are the upper and/or lower radiator hoses hot. Note I said hot, not warm. Also, are the hoses going to the heater core hot, cold, or the same. If they are hot, then you have a gauge/sensor problem and probably a clogged heater core. If they are not hot, then you have something else wrong preventing it from reaching operating temperature.

When the engine is off, can you spin the fan by hand? If not, then your fan clutch is siezed. This will make the fan run full power constantly and I suppose could prevent the engine from warming up if it is cold enough outside.

How old is the water pump? If the impeller is worn out, it won't push coolant with enough force to do its job correctly. This typically causes overheating, but it also prevents coolant from reaching the heater core if everything else is working properly.

Are you sure you got the right thermostat and are you sure you installed it correctly?
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Last edited by FireRanger; 01-16-2011 at 11:51 AM.
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  #5  
Old 01-17-2011, 08:46 PM
Grog Grog is offline
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Default Re: Engine runs cold

I found the heater core to be plugged. I backflushed it and it seems to be working. Thanks for the replies.
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Old 01-24-2011, 08:22 PM
viper viper is offline
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Default Re: Engine runs cold

I'm in the same boat. Heater goes to the white line beginning at N (barely above C) and almost no heat inside. Upper radiator hose never gets hot. The two 3/4" lines to the heater core, one gets hot, the other warm. I'll have to try the fan to see if spins freely. Had the thermostat replaced and it did nothing. May have to do the backflush of the heater core.
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  #7  
Old 01-25-2011, 06:29 PM
viper viper is offline
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Default Re: Engine runs cold

Back flush did it for me, plus truck can now go above 65 on the highway.
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