2000 LS, No heat

[jazziesdad]

Have no heat, the a/c works fine, ran the diag. and got codes 1262,1265,1947, and 5041, I don't even know where to begin, any help would be greatly appreciated

[joegr]

So, B1265 could prevent you from getting any heat, if the bypass door is really stuck. However, it's common to get false codes for this, and rare for it to actually fail.
B1947 is a bad temperature sensor, and should be fixed. However, it's probably not the issue either.
B1262 is probably a false code about the defrost door. It wouldn't keep you from getting heat.
5041 is an interesting one, SCP Invalid Or Missing Data For Function Read Vehicle Speed. It wouldn't keep you from getting heat.

Here, about in order, are the most likely of the known causes for no heat.

1. Trapped air in the heater circuit due to a cooling system leak somewhere, usually the plastic cooling system parts at the front of the engine and the degas bottle.

2. Stuck DCCV. It's rare for it to fail this way (usually fails at full heat), but it does happen.

3. A previous owner put plugs in the heater hoses because the DCCV failed in the full heat position and he/she was too cheap to replace it.

4. The aux pump (V8 only) may have failed. This should only stop the heat from working at idle though.

I've never heard of an LS heater core clogging, so I think you can skip that.

When you set it to full heat, and the engine is warmed up, do the three heater hoses get very hot?

[jazziesdad]

If you are refering to the hoses going to the heater core only 1 gets hot

[joegr]

Originally Posted by jazziesdad

If you are refering to the hoses going to the heater core only 1 gets hot

All three should be. This points to a water flow issue. (Points 1 to 4 in my prior post.)

[jazziesdad]

I'll double check that tommorrow to make sure I did it before I posted the original thread so I really wasn't just checking the hoses, but just looking at it in general

[jazziesdad]

I got heat, it was the heater control valve, took it off after alot of cussing, and it was full of crap, put the new one on, bled the system, and now I am roasting, thanks for the help.

[linc00']

Im having issues with my 2000 ls not reaching normal operating temp maybe u guys can help! Thanks

[shorod]

One thing to check is if the ECM is registering the same temperature as the gauge. Ford likes to use a separate sending unit for the gauge and the ECM. Maybe the gauge is reading different from the actual. Of course if the two are reading differently you still need to determine which one is accurate, but maybe the car is running more "normal" that your gauge indicates.

If not, then you may have a thermostat that is stuck open.

-Rod

[linc00']

I dont believe its warming up like it should because my heater is not blowing hot air either only at a higher rpm. I can use a scanner tool to see that temp ur talkin about right?

[jazziesdad]

If it's not reaching normal temp, I was thinking thermostat as well.

[shorod]

Originally Posted by linc00'

I can use a scanner tool to see that temp ur talkin about right?

Yep, a scan tool should show the engine coolant temperature (ECT) reading that the ECM is using to determine temp. The scan tool will not display a temperature for the gauge though since that is directly wired and not run through the CAN bus.

-Rod