Originally Posted by 04Duratec
hello, I replaced my t-stat on my duratec cause my temp Gauge was pegged on cold and I had just barley warm air with max heat selected. Mine didn't have the sensor on it so it was only 28$ After I got everything put back together I refilled the pressure tank and the engine didn't want to take the antifreeze it eventually sucked some in I had to drive around with the cap loose before I could put anymore in , I finally put as much in it as I took out but the level was low when I started and the pressure tank is full right now so I'm assuming I still have some air pockets in my system ?? My gauge reads right where it should now a little under half but when I'm just idling my heat goes cold/warm when I'm on the gas it's hot. I pulled the vac hose off the valve under the hood with my heat on high and felt no vaccum I remember pulling it off before playing under the hood and felt suction. Any recommendations ?
You will only get vacuum at MAX A/C and OFF. When vacuum is applied the valve shuts the heater core off. So when you have it on heat and you don't feel vacuum this is normal.
Just draining from radiator is partial drain.
Draining from radiator and removing thermostat housing hose is full drain.
Here is the procedure for partial drain:
1. Ensure draincock is closed.
2. Fill reservoir to 15 mm above max fill level.
3. Install Cap
4. Start engine and hold at 2,500 RPMS for 8 minutes until the thermostat opens.
5. Maintain 2,500 RPMS for additional 3 minutes.
6. Increase speed to 4,000 and hold for 5 SECONDS.
7. Drop engine speed to 2,500 and hole for 3 minutes.
8. Stop and check for leaks.
For full drain:
1. Draincock closed.
2. Fill to max fill level.
3. Start engine and run for 10 seconds at 2,500 rpm to prime heater circuit then turn engine off.
4. Add coolant to 15 mm above fill line.
5. Do steps 3 through 8 in first section.
6. Repeat 4000 rpms for 5 seconds and 2,500 rpms for 3 minutes.
7. Stop and check for leaks.
8. Verifiy level after 20 minutes of cooling. Top off to max fill line.