Expert: Van - 9/4/2005

Question
i have a 86 chevy S-10 with a 2.5 4 banger in it and i can't seam to get any heat out of it i have changed everthing from the termistat down to the heater core and still nothing some one told me that the hoses were on back words or maybe placed in the wrong places on the motor.
Both hoses form the heater core run in to the intake manafod and there is one hose from my temistat to the intake. so i don't know i have ran out of ideals on how to get heat. The termistat is a 180 degree one so that should put out heat.
What also has me puzzeld is that if i take the the hoses off of the heater core and plug the hose for the termistat that goes into the intake there is no water comeing out of the intake  

Answer
Hi Joe,
I have no access to anything that age, but I think there may be a fitting on the top of your water pump that has a plug in it.
That pluged hole may have had a hose fitting in it, and was accidentally left off.
I think the routing of your hoses should be:
1. The hose from the thermostat housing directly to the heater core.
2. The other hose from the heater core connects to one of the fittings in the intake manifold.
3. The hose from the other fitting in the intake manifold connects to the missing fitting in the water pump. Larger trucks have a fitting in one of the radiator tanks where that last hose goes.

That connection to the intake manifold may be a sealed passage inside the manifold to prevent ice formation under the carb, and not directly connected internally to the cooling system.

So look for a plug in the water pump.

Another thought is to go to a salvage yard, and ask them if they have a similar pickup, and would they let you look at it.

Van