Firstly this is the car I sold recently to people I know. I feel bad that they have this problem so I thought I'd try to help. The car all of a sudden lost all heat. It is a manual climate control. They have changed the therostat, hoses, and even flushed the heater core with a water hose and it came out fine on the return line. Nothing has worked and the car has zero heat. Is there something being missed? I know there is a flapper control motor for the level of the air in the car (just replaced that on my SE), but is there something similar for the temperature control? My initial thought was whatever controled the actual flow of coolant into the heater core, but I dont have a FSM and dont know anyone who has one.

Any advise would be helpful...thanks.

 

is there enough antifreeze in the system?
is the lever on the left in the down position?
is the lever on the bottom pushed ALLL the way to the right?
are you letting the engine get up too operating temperature?
have you read the other dozen or so threads about lack of heat?

 

I bet he never let the air bubbles out. Or he never did the 45-60 degree angle.

 

I have asked all these questions and looked at the other threads. I told him to put the car on jack stands and add antifreeze to get the bubbles out, and he said that he has done that. He has also said he has changed the t-stat and has set the levers properly. I havent actually worked on the car myself, but he is a transmission mechanic at a local shop so I trust he know what he is doing on it. It just seems that either he is not doing something he said he did, or there is something else.

 

I think there is actually a bleeder screw on the later VGs to use rather than the 39" method

 

When the car is running are both the heater hoses hot? Or is one cold and the other is hot?

 

I told them about the bleeder screw and told him to check the lines. His wife just told me that he did something last night and got a little heat, but she didnt know what he did. I'm going to put my money on air on the heater core at this point, he just didnt get it when he jacked the front end.

 

But when you rev the engine it should be enough pressure to push the air plug out of the heater core and into the radiator, where it can get out thru the open cap??? That's how my mechanic got rid of the air after he changed my timing belt. He filled up the system, left the cap open and revved the engine. There was some bubbling in the throat of radiator and a few fountains, when they stopped I had nice warm air from the vents.

 

Take hose off from the temp ctrl valve under the hood, insert extension hose into a bucket, start & rev engine shortly. Should shoot out coolant. If not, totally collapsed/bent heater hose, blocked piping from thermostat (ripped/blocking gasket?).

Another good bleeding method is loosen and cause a tiny leak: drive one hour 2000rpm or over.