Hi Rob, great to hear from you again.
92lover wrote:i'm going to wear out my welcome here...
92lover wrote:...its SoCal, who needs heat?
Hey, I used to live in SoCal. It does get cold there.
92lover wrote:Whats the "sensor" looking thing connected to one of the lines?
That sensor monitors the temperature of the coolant passing through the heater hose and heater core (when connected). Our cars are equipped with Automatic Climate Control. When the climate control is set to "Auto" and the passenger compartment is colder than the temperature set on the control panel, the system opens the temperature control valve to allow coolant into the heater core to provide heat. The sensor measures the temperature of the coolant and disables the Climate Control System fans inside the car until the coolant temperature reaches a preset minimum. This prevents the system from working until the engine reaches operating temperature. On the other hand, on a hot day, when you want colder temperatures inside the car, the system will work immediately without delay. It doesn't need warm coolant to operate the air conditioning.
92lover wrote: Second, how big a hassle is it to change the core if its bad??
I once downloaded a link showing a step-by-step with pictures on how to replace a heater core in a Mark VII. This link has since been disabled. Lets just say that heater core replacement involves unbolting and and swinging out of the way the passenger of the dashboard. I need to replace the heater core in my Mark, too, but don't look forward to it.
92lover wrote:...and could this "rigged" system affect my temp gage, cause it barely climbs into the normal range, even after driving for nearly an hour.
This would have no effect on the temperature reading on your gauge. Given what you have described, I would replace your thermostat. It is either stuck open or someone removed it. These cars NEED to run at a specific minimum coolant temperature or else the emission controls don't work right and we definitely need these controls to work properly to pass the California Smog Test.
"This car may be old, but it will still climb Kirker Pass at 110!"
- quote of the original owner of my green 1964 Chrysler 300-K
1989 Mark VII Bill Blass (Oxford White)
1989 Mark VII LSC (Pewter Metallic)
1989 Mark VII LSC (Sandstone Metallic)
1/2 of a 1992 Town Car Signature (my guaranteed inheritance)