No Heat in Ohio.....

Hi all, I have a 1988 Pontiac Lemans. The engine is a 1.6 L and it has a automatic transmission.
Anyways the problem is I have no heat, I mean none it has been a long
time problem since I aquired the car.
Here is the history on the car, The engine has just about 20000 miles on a rebuild and is properly tuned (timing included) and always starts and runs great even in negative weather. The heater core is new (within a year) and is not plugged, I have blown through it and no clogs less then a month ago. The thermostat was replaced a week ago (before it had no heat and still does not). The temp on the thermostat is a 192 degree one (oem). The water pump is also new since the old one (which was new at the rebuild whined) so I replaced it just because. I have replaced and checked the most common reasons for no heat. I have checked all the above plus fan motor, intake, and exhasut pipes and all are well.
Now the factory service manual, mentions to double check the heater selector lever at the heater core box (can't remember specific enclosure name) and to back fill the heater core with fluid.
Does anyone else have any other suggestions?
Because I am going to be doing this in 20 degree weather at best and was hoping to solve it this attempt. So all ideas are helpful.
Thanks in advance, Chris
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On 29 Jan 2004 14:29:59 -0800, solomon snipped-for-privacy@yahoo.com (Chris Gray) wrote:

Sounds like the heater selector lever, the one that controls the temperature is not working correctly.
These things work in a variety of ways.
Some activate a vacuum motor which moves a little bypass valve that is inline with one of the hoses going to the heater core. Usually the valve is located under the hood on the passenger side and will have a small vacuum hose attached to it. If the valve is stuck closed no water will go through the core and you won't get heat.
Others have water going through the heater core at all times and have a door that blocks it from the blowers air flow when you move the lever toward cold. If the door is stuck blocking the heater core from air flow you will get cold air out the vents.
Find the inlet and outlet hoses for the heater core coming from the firewall. If both hoses are HOT the core should be passing water and that would mean you have a distribution problem, meaning the air from the blower motor is NOT blowing across the heater core so you are getting cold air. Most likely a broken vacuum hose or defective/stuck vacuum actuator.
If one hose is hot and the other cold then the valve that allows the water to flow through the heater core is closed. Find the valve and see what actuates it and take it from there. It might just be that the linkage from the Temperature Control lever has fallen off.
Good luck.
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The only other thing that causes low heat is an blown head gasket it doesn't take much in a smaller cid. engine.
Jim.J
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