With car at full operating temp and fan blower on- I have zero heat. Do I even want to dig into this project since I barely drive it when the weather is cool? Causes?
Does your car have a heater contol valve in the hear hose set up? If so it will have a small vacuum line running to it. Feel the hose on both sides of the valve If one side it is hot and the other cold it is the valve or problem with sealing of the vacuum line neeeded to operate the valve.
Not sure what you might have checked to this point, and to cover all the bases, what about the thermostat under the water neck on the front of the intake manifold.
Thats brand new. Im going to check the rest of the stuff tonite, couldnt get to it last nite- had classes.
Does this mean thet you recently changed the thermostat?? If so, perhaps there is not enough antifreeze still in the engine to permit heat. With the engine cold or cool, double check the coolant level. You might also have an air bubble still in the cooling system. Ask me how I know about all this stuff??:laugh:
Good idea- but no bubbles. I changed the thermostat a little over a year ago (600 miles ago) and I know that is not it.
Since AC, car check all vacuum hoses. Most common as said before is heater valve or vacuum cannister on fire wall or maybe to back of carb. Easy to knock these off and forget them. ALso with car running and warm and heat on and grab the hose where it leaves the heater valve and before it enters the firewall to the heater core. If it is hot you are getting hot water to the core and should have heat. If hose is cool I bet brass valve is no good. Also check all vacuum lines under dash
this happened to me a year ago. My heater vacuum diaphram went out. So i replaced it with a manual valve / barb setup and now i have heat all the time. it not bad though because when the blower is on it heats up, when its off, its barely noticible. Plus i always cruise around with the windows down.
Should be able to pick up a suitable manual valve in the plumbing department of any home improvement store. I was at Lowes yesterday, and discovered that they have a pretty comprehensive supply of NPT fittings, compression fittings, as well as hose barb stuff. They even sell heater hose by the foot. Not a bad idea for a fun car. Close the valve when you do the spring oil change, open the valve when you do the fall oil change. If you don't mind "heat all the time" you could just delete the valve and run straight hose from the heater core to the intake.
Though I should also mention that the vacuum valve is readily available from any major auto parts store, or online from Rockauto/similar. They are like $20-$30.
