My Air Conditioner for my car isn't cold, I think that I have too much refrigerant in my pipe, it's on Danger.

Question:
My low pressure pipe is on danger, it's on 90, do I need to empty it and maybe fill it back up with some new r134a refrigerant and put in the right amount for my a/c to work?

Answers:

My service engine light came on on my Honda Accord, I did an electronic scan and the code P1739 popped up?

Take it to a shop and have it diagnosed. Plus, there is a little more to refrigerant swapping then just draining your old stuff and putting in a new type of refrigerant. If your current system needs a new condenser or whatever and it's going to cost some bucks, then yes, convert to the new refrigerant because you'll have to do a mechanical conversion as well and it will cost you about the same.

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A question about a egr valve?

This sounds like too much head pressure in the condensor... need to take it to a qualified shop ASAP or you risk damage to your system.

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I have a cracked bumper on my 2005 dodge dakota truck. how much should i expect it to cost to have replaced?

You need to measure both the low and high pressure sides to know what's wrong. You can have a clogged pinhole and get a low pressure reading on the low side even though you have enough refrigerant. There's no need to empty it before you add some. If the low and high sides both read too low, then go ahead and add some while monitoring the pressure.

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