Hello, this is actually my first forum ever. I've been a fan for a while and it has helped me immensely. For that I thank everyone. I have a 2000 stype 4.0 that does not blow hot air nor does the heat transfer from top, vents, or bottom. Can anyone help?

 

Look for posts about DCCV - the 5-hose (5-port) version. (Cars - including 3.0 - before 2003.)

 

Hello, and welcome to the forum. Let's see if we can be of any assistance.

Some preliminary checks:

Make sure the coolant level is correct. These heaters are very sensitive to low coolant, especially at idle. Is your lack of heat at all engine speeds? If only at low RPM, low coolant could be the culprit. The V8 also has an aux coolant pump to help the heater at low RPM.

Make sure the dash gauge shows coolant temperature in the middle of the range. If the thermostat has failed so the coolant isn't warming up properly, you'd have no heat available from the heater core.

What happens when you set the temp panel to HI? This setting bypasses most of the auto features and helps rule out many components.

Try disconnecting the electrical connector at the Dual Coolant Control Valve (DCCV). This valve is down low to the right of the radiator, when facing forward. Access is a booger, but is worth it for troubleshooting. The two solenoids inside the valve are spring-loaded to the open position. Remove power from the solenoids and you should get full heat. If not, the valve innards are likely corroded and stuck in the closed position.

This website has more info, but the diagnosis section is designed for symptoms of no cooling, which is opposite of what you have:

DIY: Diagnose It Yourself - JaguarClimateControl.com

Please note they talk about faults in the valve burning out the control panel, but that is generally only for 2003+ models.

 

I just had another idea to accomplish the same thing, if you don't mind being my guinea pig. At the front power distribution box, remove fuse #1. This removes power from the DCCV, and sure beats wrestling with that buried connector.

The same fuse also supplies power to the AC clutch, so the AC system will be inop. Also, the V8 aux cooling pump is on the same fuse, so you will have to rev up the engine to get hot coolant flowing properly.

So if you'd like, try removing that fuse and see if you now get heat. I'd try it on my car but my son borrowed it for a date. Something about the Jag mystique...

 

Thank you kindly gentlemen.

 

See if this information helps but remember this link is for a 3.0 not a 4.0

Link JagRepair.com - Jaguar Repair Information Resource

This other link is electrical for your car.

Link http://jagrepair.com/images/AutoRepa...01999.25en.pdf