scruge
January 7th, 2004, 02:07 PM
I'm HOT for someone to help!
I've got a 99 Navigator with Automatic climate control that seems to have a mind of its own. I'm the original owner and about 2 years ago the climate control started acting up. I've had it into the dealer 3 times now and it keeps coming back as "Not able to duplicate problem" .
The problem is when the system acts up, usually after 20-30 minutes of driving, it under reads the temperature by 12-15 degrees. Meaning, when its working properly and the cabin temp is set for 76 degrees and a thermometer used to report the actual cabin temp is reading within a few degrees of the set point. When the climate control malfunctions the actual cabin temp raises to 88-90 degrees.
There are several things I can do when it malfunctions
1. I can run the setpoint down to 64-61 degrees and the system will regulate around this temp until it decides to start working again at which time it then attempts to bring the cabin down to an actual 64-61 degree range.
2. I can sometimes turn the system off and then back on which works for a brief spell.
3. Stop and restart the car.
An additional note. When the system malfunctions it also misreads the outside temp by displaying a temp 12-15 degrees below the actual outside temp.
I'm familiar with running the climate control self test and I'm above average with working with electronics at the discrete component level. I'd like to attempt repairs myself if I only knew where the 3 temp sensors were and what their normal readings should be using an ohm meter, provided they are thermistors ( I assume that's what Ford uses verses thermo-couples).
The 3 sensors my Haynes manual shows in the wiring diagrams are "ambient (outside), Sunload (radiant) and In-car (cabin).
Thanks in advance for any advice.
I've got a 99 Navigator with Automatic climate control that seems to have a mind of its own. I'm the original owner and about 2 years ago the climate control started acting up. I've had it into the dealer 3 times now and it keeps coming back as "Not able to duplicate problem" .
The problem is when the system acts up, usually after 20-30 minutes of driving, it under reads the temperature by 12-15 degrees. Meaning, when its working properly and the cabin temp is set for 76 degrees and a thermometer used to report the actual cabin temp is reading within a few degrees of the set point. When the climate control malfunctions the actual cabin temp raises to 88-90 degrees.
There are several things I can do when it malfunctions
1. I can run the setpoint down to 64-61 degrees and the system will regulate around this temp until it decides to start working again at which time it then attempts to bring the cabin down to an actual 64-61 degree range.
2. I can sometimes turn the system off and then back on which works for a brief spell.
3. Stop and restart the car.
An additional note. When the system malfunctions it also misreads the outside temp by displaying a temp 12-15 degrees below the actual outside temp.
I'm familiar with running the climate control self test and I'm above average with working with electronics at the discrete component level. I'd like to attempt repairs myself if I only knew where the 3 temp sensors were and what their normal readings should be using an ohm meter, provided they are thermistors ( I assume that's what Ford uses verses thermo-couples).
The 3 sensors my Haynes manual shows in the wiring diagrams are "ambient (outside), Sunload (radiant) and In-car (cabin).
Thanks in advance for any advice.