Found the problem. you are running in circles instead of actual diagnostics to rule out and move forward.
Nobody can help you from across the internet on your assumptions.
Start over with a "Voltage Drop Test" of all the battery cables (positive and negative)
Check the ground coming off the...
Second what @99WhiteC5Coupe said.
You can not diagnose anything electrical until you know it has and is getting the correct voltage.
Start with your battery Go get it tested properly, any Auto parts stores do it for free.
Once you know that you have a good battery
do a Voltage Drop Test to...
And there is the problem. When you flush you have a huge chance of a leak.
Especially if it has never been changed.
You can do the flush and if you get a leak then you would have to bypass the heater core.
But you would have no heat, no defrost at all.
At least you have some heat now...
More than likely the heater core is getting clogged up on the inside.
You could flush it but you take a chance on springing a leak.
Changing out the heater core is a major undertaking.
Welcome to the forum
I wish I had that advice three days ago. I am working on my 02 eb 5.4 and
i broke that special bolt off because of that carbon and they don't make them anymore.
All the junk yards are broke off (go figure) so I am going to get a longer bolt and put a sleeve on it.
(just have to drill out the...
Engineers biggest fight is not the build, it is keeping their build in one piece.
Engineers like to build and add, and everyone always blames them for cuts when it probably wasn't their decision.
More like the accountants telling the engineers to cut cost to the build
and they have to find...
Thank you for sharing your expertise, and that is exactly what I mean.
But even with all that expertise, it still didn't help the OP with his problem either.
Not at all,
Just saying if you don't post what you have already done or already know, Someone is going to say it.
When they do, a simple already read/knew that and move on will do.
There is a lot of good info on this forum, glad you are here adding to it.
You just got here, How is anyone in this forum suppose to know you? That you know what you are talking about?
We treat all newbies as if they have bare minimum knowledge. We don't know you and you don't know this forum.
Don't be that guy who gets mad when someone tells them to read the owner...
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