I need to now were i charge the a/c

I think we all just live in a world of automobiles,that have
too much high tech technology,when not so much is needed,
just to keep exhaust emissions at an acceptable level

At least you kept going back to the dealer & not keep driving
as most people do

You gave the dealer techs several chances at resolving the issues,
all be it, expensive, to say the least.

I don't see anything where you went wrong, or they let you down,
assuming your good to go & no more issues

I assume that the head gasket was something that only moved
& leaked internally under certain conditions & I don't know why or
when the ECU came up as a problem,they don't fail often

If it needs to be charged,it has a leak & is poluting
the atmosphere

Therfore it need to be leak tested,system repaired,
a vacuum pump attached & the system vacuumed
dry,then properly recharged

You have no way to add & know what is in there
or being put in

You need A/C Manifold Gauges just to check the system
operation & charge correctly.

Charging may not be the issue at all

Need it diagnosed by a person train in A/C repair

You don't actually charge it

Your referring to adding to a system ,that
doesn't work & is leaking & poluting the atmosphere

So to add,is to be irresponsible

You need a qualified a/c technician,to find & repair
any leaks
Then it is evacuted with a vacuum pump & checked
again in a vauum for leaks vs: under pressure as in
the beginning

Then the refrigerent is entered under a vacuum
(charged) in oz's with a scale,so you don't overcharge

So you see, without the knowledge & proper equipment,
you can not properly work on any A/C system,roof top,
commercial,window unit,refrigerator,etc.

How good are the ends of the battery cables at the battery? Loose connections or acid swelling the cables will do that. Also make sure there is a good ground between the engine and body.

My advice is to have it checked at a a/c shop. they can tell if it's leaking, u may have to replace compressor. u can buy a recharge kit but will be wasting your money, Shops don't usually charge to check item, will give u an estimate. if you don't trust then, go to another shop..

You answered your own question

You going in the right direction,but you don't
have the experience or meter to test anything

So you go to a repair shop & have the battery
tested ,as well as the alternator & current draw

You don't recharge

If the system needs refrigerant, you have
a leak that needs to be repaired

The refrigerant is recovered,leak fixed,a
vacuum pulled & system properly charged

If you have no A/C training, you should not
be doing any type of work on any system

Vehicles don't follow the same principals
as commercial a/c

Against federal laws to let refrigerant into
the air & you will, as well as ruin your compressor
& system

You don't charge an A/C System that leaks

That is against Federal Laws & polutes the Atmosphere

Any repair shop doing so ,should & have been fined
& the fines start at $5,000 or $10,000

You have it evacuated & repaired,then properly
recharged

I can not believe you even requested that it be
charged

People have to started getting involved & educate
themselves on all vehicle issues.

You need to have the A.C recharged and checked for leaks. The coolant is for the engine heat. Freon charges the A/C unit and is installed through the steel lines with the caps on them. This is recommended by a repair shop and not something that should be done at home.

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when you charge battery the workshop have to check charging of alternator if ok ,if not it may be the battery don't accept charging and may need to be changed.