what should i do?
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Joined: Mar 2007
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what should i do?
okay, i am replacing the thermostat on my truck. and my dad accidently cracked that piece the thermostat goes into (dont know what its called) so i got one off of the same engine(1985 4.9L inline six ) and on the new one there is a hose that runs from the top left of this unamed piece into the engine... heres the problem my old "un named piece)" did not have this tube and the point at which this tube connects to the engien was blocked off with a hose clamp and cap..... the reasopn why i am replacing thisis because the truck was overheating.... and when i took the cap off of where the hose is suppose to go rthere was green liquid(radiator fluid)...should i put the cap back on or should i connect the tube
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Joined: Feb 2005
Posts: 139
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From: Noth Georgia
The unnamed piece is your thermostat housing. the piece that WAS on your truck was the incorrect piece. install the replacement and run a piece of hose (5/8 in ID) to the port that was blocked off. this is called a bypass hose, it is there to releave cooling system pressure during cold starts (while thermostat is closed) to avoid blowing a gasket due to excessive pressure.
insure the new thermostat is installed correctly, with the spring facing engine.
Overheating may be the result of something other than the thermostat. If it is primarily while sitting, check your fan (clutch) also check your belts and hoses. to check a fan clutch, with the engine OFF and key IN YOUR pocket. try turning the fan by hand. it should move with reisistance. if it moves freely, the clutch is busted and should be replaced. check belts for proper tension. there should be no more than 1/2 in deflection on the longest run on V-belts. If it has a serpantine belt, there will be a small rectangle with a mark pointing at it on the tensioner pully. if the mark isnt pointing at the rectangle, the belt isnt the proper tension. any glazing is a sign of looseness and could cause the belt to slip if load is applied.
check the lower rad hose by squeezing it firmly with the system pressure releaved. (engine cold, rad cap removed). there should be a spring that prevents you from squeezing the hose. if the spring is removed, the water pump could actually suck the hose closed during higher RPM driving. I have seen it at 2500 on older hoses.
Another possible cause could be coolant contamination. the T-stat change is a perfect oppertunity for a flush. A flush will help break up any corrosion that might be built up in your cooling system, and you will know that you have good coolant in your system
insure the new thermostat is installed correctly, with the spring facing engine.
Overheating may be the result of something other than the thermostat. If it is primarily while sitting, check your fan (clutch) also check your belts and hoses. to check a fan clutch, with the engine OFF and key IN YOUR pocket. try turning the fan by hand. it should move with reisistance. if it moves freely, the clutch is busted and should be replaced. check belts for proper tension. there should be no more than 1/2 in deflection on the longest run on V-belts. If it has a serpantine belt, there will be a small rectangle with a mark pointing at it on the tensioner pully. if the mark isnt pointing at the rectangle, the belt isnt the proper tension. any glazing is a sign of looseness and could cause the belt to slip if load is applied.
check the lower rad hose by squeezing it firmly with the system pressure releaved. (engine cold, rad cap removed). there should be a spring that prevents you from squeezing the hose. if the spring is removed, the water pump could actually suck the hose closed during higher RPM driving. I have seen it at 2500 on older hoses.
Another possible cause could be coolant contamination. the T-stat change is a perfect oppertunity for a flush. A flush will help break up any corrosion that might be built up in your cooling system, and you will know that you have good coolant in your system
