Lincoln LS overheating and AC blows hot air (ambient)

[TerryM1906]

I have a 2001 Lincoln LS, V6 3.0L which has been overheating and the only way to get it to go down is to turn on the heat all the way up to the hottest setting and the blower on max. I also have my AC blowing hot air (ambient) and every once in a while I can hear my compressor hissing but will stop after about 10 seconds.

I also checked my supply and return hoses between the DCCV and heater core which did not display the same temperature after my car reached operating temperature.

Could both problems be a DCCV issue? If so, how do you change out the DCCV that has the 5 hoses connected to it. If you have pictures associated with the instructions, that would be helpful.

 

[joegr]

I've never heard of a compressor hissing. Are your sure it's not the expansion valve (inside the dash) that you hear? If it is, then that is a sign that you are low on refrigerant.

If you get warm (not cooled and little heated) air when calling for cooling, and very hot air when setting it for full heating, your DCCV is probably okay.

The problem that your should be trying to solve first, is the engine overheating! Note that the PCM will disable the AC compressor while the engine is overheating. Search the threads on here. There are two major causes of overheating on the Gen I LS. 1. Problems with the hydraulic cooling fan system. 2. Leaks through tiny cracks in the plastic cooling system parts. (The leaks let air in, which blocks coolant circulation.)

 

[Blueberryyum02]

I've never heard of a compressor hissing. Are your sure it's not the expansion valve (inside the dash) that you hear? If it is, then that is a sign that you are low on refrigerant.

If you get warm (not cooled and little heated) air when calling for cooling, and very hot air when setting it for full heating, your DCCV is probably okay.

The problem that your should be trying to solve first, is the engine overheating! Note that the PCM will disable the AC compressor while the engine is overheating. Search the threads on here. There are two major causes of overheating on the Gen I LS. 1. Problems with the hydraulic cooling fan system. 2. Leaks through tiny cracks in the plastic cooling system parts. (The leaks let air in, which blocks coolant circulation.)

+1

 

[LS4me]

I've never heard of a compressor hissing. Are your sure it's not the expansion valve (inside the dash) that you hear? If it is, then that is a sign that you are low on refrigerant.

If you get warm (not cooled and little heated) air when calling for cooling, and very hot air when setting it for full heating, your DCCV is probably okay.

The problem that your should be trying to solve first, is the engine overheating! Note that the PCM will disable the AC compressor while the engine is overheating. Search the threads on here. There are two major causes of overheating on the Gen I LS. 1. Problems with the hydraulic cooling fan system. 2. Leaks through tiny cracks in the plastic cooling system parts. (The leaks let air in, which blocks coolant circulation.)

+1

+16543; if that's how many separate overheating threads there are.....

 

[TerryM1906]

Is there any reason why my inlet and outlet heater core hoses would be different temperatures after engine has heated to normal operating conditions?

 

[joegr]

Is there any reason why my inlet and outlet heater core hoses would be different temperatures after engine has heated to normal operating conditions?

Yes. That's the way it works.
The air that the blower under the dash blows across the heater cores removes heat from the coolant. So, the outlet will be cooler than the inlet. It's just the same as with the radiator. Hot coolant enters one side, air blow through the radiator cools the coolant, and cooler coolant exits the other side of the radiator.

Why are you stuck on this?
You need to fix your overheating problem first. Again: There are two major causes of overheating on the Gen I LS. 1. Problems with the hydraulic cooling fan system. 2. Leaks through tiny cracks in the plastic cooling system parts. (The leaks let air in, which blocks coolant circulation.)

 

[1LoudLS]

Is there any reason why my inlet and outlet heater core hoses would be different temperatures after engine has heated to normal operating conditions?

how exactly is a rainbow made?
How exactly does the sun set?
How exactly does the posi-trac rear end on a Plymouth work?


It just does.



if with any air to water heat exchanger, you have the same temp at the inlet as you do with the outlet, it isn't really a heat exchanger is it?