Well, compared to most other vehicles, including the D1, there is some sort of valve to knock down the coolant flow to the heater core so the AC does not have to deal with that as well. But it is a covert combustion gas in coolant detector. And turning on the heat to max would give some air flow over this small remote radiator, helping a bit. But not like say the D1, where turning on the heat injects an immediate slug of coolant that has been inside the passenger cabin, and expands the cooling square inches by adding the heater core to the circuit. In the D2 the core is already in the circuit.

yep, it is fun to run back and forth, and if you don't Murphy will be watching and strike when you are not expecting it.... like when I replaced my rad, and was checking for leaks, all proud of my efforts, when I returned to the dash and saw that the oil light never went out... the oil cooler was obstructed!

 

Thanks guys, I have printed out this entire thread, and attachments, plus he has the RAVE along with it. Wish him luck, as he starts this morning.

 

We have been waiting up nights to hear all about it.

 

Buzz, I know you have lost sleep over this,

Well my Prince Charming has fixed my beast! Hmmm amazing how that works when you follow the manual thanks guys

 

Just remember to check the coolant level cold (I usually check in the morning after it has been parked overnight) over the next few days, and re-top as necessary (cold) just in case the system had a few air bubbles that didn't escape during the bleed process.

 

Please have him advise what he feels the solution was. And congratulations!

 

Well he thought he had it taken care of, but nope!

I took it to town, it was fine the first half of the trip, except I noted it had a long delay putting out heat. Then the heat would come out intermittently(cold then warm)

So Patrick read up and told me to put it on economy for heat, and that is when it started overheating. We got it home, coolant is at the same level when I left (full) no white smoke coming out of the tailpipe. We are obviously missing it.

He is now wondering if he is going to have to replace head gaskets

 

I don't know man......I do not have that much experience with older Discoveries than my '03 but I know for sure that the HEAT needs to be ON (temp. increased to MAX and fan working) while you are bleeding the air out of the system. Did your husband do this? When you mentioned that the heat was switching from COLD to HOT that tells me that there was air in the system.
As for head gaskets.....don't think about this right now. Everything should be OK. You are not the first or last Discovery owner that had the truck overheat a little bit. As long as you made it home and did not get stranded on the side of the road with coolant pouring out of the truck, you are probably OK. Let's get this problem solved first and then pay attention to "white smoke" out of the exhaust in the next few days. I am pretty sure that you should be OK. Don't worry too much.
Ask your husband if he had the HEAT ON and fan working as he was bleeding the air out of the system?

Let us know.

 

Boris,

Yes max air was on when bleeding. Maybe some leftover air bubbles. One thing I noticed was no more waterfall in the dash, so there's a positive. Seems to be running fine in the driveway for Patrick, maybe the beast is allergic to females.

 

A few questions first: You said "coolant is at the same level when I left (full)" The level it was at when you left: was that cold, or hot?

The level in the reservoir will raise as temperatures and pressures increase. It might have a leak (internal or external) and if checked cold, driven (and lost coolant), the hot level might appear to be the same.

I have re-read the entire thread. The first time, the temps went back to normal when you turned OFF the heat, but you were not moving, just stationary, from how I read it. This time, when you selected economy mode, it started overheating.

Out of curiosity, how do you have your HVAC set: Auto, or to a specific vent setting? I leave mine on auto, and set the temps. When in that mode, the defrost cycles first within a minute or so, and seems to stay on defrost until the engine is at temp, then switches to floor until the selected temperature is reached. After that, the dash vents begin to blow more forcibly, and I have noticed that even when the external temperature is lower than the selected temperature, the dash vents do sometimes blow colder air, as the HVAC is constantly making changes to what temperature air blows out which vents to satisfy the operators desired temperature.

I'm still trying to run through scenarios in my head, and will get back to you.