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Re: dodge ram cooling system
First, try sqeezing the hoses several times too get any air out of them. second, you may have put the thermostat in backwards, so it is not going to open and let the coolant flow thru.you could ruin your engine instead of your radiator. good luck
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Loss of power is likely caused by overheat condition. Check your coolant level, thermostat operation(both upper and lower radiator hoses should feel hot), fan motor/clutch operation and radiator cap for proper pressure retention. Also, pressure test cooling system if coolant is leaking out.
If rad is plugged/restricted the vehicle will overheat. If thermostat is opening, both upper and lower rad hoses will get hot. If there is a rad problem with circulation, the upper hose will get hot and the lower hose will be cool/warm
Yes a vacuum leak can cause the vent valves under the dash to not operate. To check this go from heat to defrost and see if you can feel the air flow change from out the dash or foot area to the window area. If it does change then it is probably not a vacuum problem.
If you live in an area where it is very cold as I do in the winter try putting some carboard between the rad. and the grill. This contains the heat lost. Just make sure you remave it when it gets warmer.
3.7L/4.7L:LOCATED IN LOWER HOUSING ATTACHED TO TIMING COVER..WHERE LOWER RAD HOSE GOES TO ENGINE..PLASTIC HOUSING WITH 2 BOLTS.
5.7L:IN WATER PUMP UPPER HOUSING WHERE METAL HOUSING ATTACHES FROM UPPER RAD HOSE..MAKE SURE ON ALL ENGINES YOU REMOVE BLEED PLUG WHEN REFILLING COOLING SYSTEM TO GET RID OF AIR TO PREVENT ENGINE OVERHEATING
THERMOSTAT IS LOCATED ON ENGINE FRONT TIMING COVER ON A 4.7L ENGINE..FOLLOW LOWER RAD HOSE FROM RAD,YOU WILL SEE A PLASTIC HOUSING WITH 2 BOLTS IN IT..THERMOSTAT IS LOCATED HERE..TIIMING COVER..TRY TO GET AN OE THERMOSTAT..MAKE SURE YOU REMOVE BLEED PLUG AT ENGINE SIDE OF UPPER RAD HOSE WHILE REFILLING COOLING SYSTEM..MAKE SURE ALL HOSES GET HOT AND LOTS OF HEAT FROM HEATER..REINSTALL BLEED PLUG WHEN COOLANT STARTS COMING OUT OF IT..LET ME KNOW HOW YOU FAIR OFF
you need to get under the dash board and remove the passenger lower kick panel. ther will be a small motor bolted into the evaporator housing. remove it and manually move the blend door. if the heat gets hot the you need a blend door actuator.
Not sure about the 4 runner's cooling system, but if there is airlock I usually take the coolant back out, take the thermostat back out, fill the engine block from this hole with 50/50 coolant, reinstall the thermostat, upper hose, fill the radiator and tank, then run the vehicle with the heater on max (rad cap off) and then fill the rad as the rest of the air comes out.