Mazda 626 Air conditioning troubles

askperry

When I put the gas to (or near) the floor on my 91 Mazda 626 (non-turbo) the air conditioning cuts off for a moment. However, lately it doesn't come back on.

Does anyone know what causes this?

timraynaud

Driving along...everything working fine...ac blowing cold. Then...out of the blue...the lights on the ac panel go out and it stops blowing cold. the fan is still on...blowing warm air (obviously over the engine) and none of the buttons respond when pushed. the fan control knob works...but none of the buttons. checked the main ac relay in the fusebox...it's still good...but there must be another power relay or switch or something. any thoughts?

gusser

Please help, my son has a 2000 Mazda 626. I have paid twice to have freon added. Both times within 2 weeks the A/C would no longer get cold. The mechanic said he tightened something and this should fix the problems. He found NO leaks. Now he is saying the A/C evaporator coil under the dash probably needs to be replaced. Has anyone has this problem and is 600.00 a fair price to have this job done? Or does anyone know where I can find a used A/C Evaporator coil?

shanem75

Did you ever fix the problem? I have a 2003 Protege with the same problem.

wayne0832

I have a 2000 626 and the dealer charged me 800.00 to change the evaporator, that was not the problem. They then told me it was the hoses and wanted anothe 650.00. I did not change the hoses, felt I was getting hosed enough. What I did find (on accident) their is a relief valve off the compressor that was leaking. I guess because it was under the car they did not check it. I cleaned it and tightened it down and it stopped leaking. As for the spent 800.00, the dealership would not refund, the BBB was not any help either.

ucee

I have a 2000 mazda 626, automatic. the car was bought used. due to a leak ,there was no gas in the compressor when the car was bought. after fixing the leak and gas added the AC was working but after working for about 45munites and u drive to a halt the compressor will be cutting and picking within seconds. this will eventually lead to the engine going off. due to this problem i cannot use the AC in a traffic- jam. i feel this is unusual. the technicians say the thermostat has to be changed from automatic to manual. please i need solution to this.

p100

You do not want a used evaporator. The $ 600 dollar fix quote is a bargain, as most of that would be for the labor involved to get to the evaporator. On some cars, like Mercedes, it can cost up to $ 2,000 to replace that part.

The problem may not be the evaporator itself, but one of the A/C tubing connections. There is an O ring in every one of these and it can start leaking. Also, the connection B nut threads must be lubed with refrigerant oil prior to disassembly, otherwise it may be practically impossible to tighten the nuts enough to properly compress the O ring. There is a built-in shoulder in the tube, so you cannot squish the O ring even if you overtighten the connection. Oil on the threads prevents the possibility of twisting the tubing due to excessive force required.

p100

Also, one reason why A/C may stop blowing cold is a clogged orifice tube which is located in the hard line going to the evaporator.

paris5717

i have two 626's a '99 and a '98 both v6's. i am pretty savvy with wrenches but had overheating probs in standing trafficon my '99. So I replaced passenger side fan and was fine for a while til the new fan burned fuses and burn out! So spent money at a good shop who replaced both fans after they replaced fan assy at there cost....because they burn new fans out too, was told my ac clutch was to blame for high amp drain. new ac pump was quoted at $1100! Question... why does madza design a system that fails like this? i replace my ac pump and accumulator and oriface tube myself with advanced auto parts for $310 then took it back to shop for diagnostic and evac and new freeon fill. saved money

subheavy

I have checked the coolant and it is fine. The compressor comes on, but it only blows hot air. Everything works, but it only blows hot air. Can anybody give me a list of any possible solutions to this problem. During the winter months the heater doesn't blow any heat. Once the engine heats up, the vents throw out enough heat to keep you warm.

justjeff2

The AC on my 626 is working, but it isn't working.

The unit is fully charged... the compressor works when manually jumped... it will then blow cold air.

There is nothing in the computer code information that gives any clues.

There is some sort of relay or switch not doing it's job. Has anyone else run into this? I don't want to chase the proverbial needle in the haystack unless I have to.

Thanks in advance.

wayne0832

There is a relay, I had mine replaced while it was still under warranty. The relays are under the hood on the drivers side. I think there is a relay for one of the cooling fans that runs constantly when the A/C is running. If it goes out it prevents the a/c from turning on. Most of them are the same and can be swapped around to test.

justjeff2

I checked the relay by swapping with the horn relay (same relay). When the horn still worked, I knew that the relay was good.

There are two switches (one high pressure and one low pressure - I forget which is which), but one is on the back of the accumulator. That was the culprit.