Expert: autohelp - 9/26/2008

Question
QUESTION: replaced heater valve but heat still pours through vents. Checked vacuum line and no pressure to valve. Is the vacuum line connected to heater or is there a switch that operates vacuum line pressure? vehicle is 1983 El Dorado 4.1L engine.

ANSWER: When there IS vacuum at the heater valve vacuum hose the valve is CLOSED and no water gets to the heater core.

When there is NO vacuum at the heater valve vacuum hose the valve is OPEN and hot water gets to the heater core.

 Since the above is TRUE and you have the same results, Then your problem is with the A/C-Heater PROGRAMMER which will need to be replaced and calibrated.


If you are mechanicaly inclined or know of someone who is, You will need simple electrical schematics, Test procedures and picture locations of the components within the system that is causing you problems of which can't be done on this website which only allows one picture. I do not have a website so you will have to e-mail: onlineautohelp@msn.com in order to obtain the information.


---------- FOLLOW-UP ----------

QUESTION: Is the Programer a module or a mechanical device? (ie.,like a valve as opposed to ECU type device)I do have some mechanical ability,but not too much for more complicated electrical sysems.

Thanks again for your help. . . great expertise.

CD

Answer
The vacuum to the water valve is controlled by the PROGRAMMER MODULE.

I can help you fix this problem.


If you are mechanicaly inclined or know of someone who is, You will need simple electrical schematics, Test procedures and picture locations of the components within the system that is causing you problems of which can't be done on this website which only allows one picture. I do not have a website so you will have to e-mail: onlineautohelp@msn.com in order to obtain the information.