Question about 2003 Chevrolet Blazer

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After you fix a leak in the 2003 blazer cooling system, do you have to reset the computer to get it to read the pressure right

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Assuming you are talking about the engine cooling system, no you do not have to reset the computer. The computer does not read the pressure, it reads the coolant temperature.

Posted on Oct 03, 2010

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5 Answers

Why is it leaking?


It sounds like a water pump. Releasing the pressure by removing the radiator cap could make it start leaking again because the water pump is probably the only component on the cooling system that would leak, then stop and then leak again. If you had a void in the radiator, hoses or expansion plugs, releasing the pressure would have no effect.

the water pump us with the timing belt so the repair will be extensive. You must check the cooling system's ability to hold pressure, and different pressures at that, with a cooling system pressure tester. That's really the only right way to diagnose this.

Apr 06, 2015 | 1997 Geo Prizm

2 Answers

Water sound when i accelerate my 2003 blazer


intake or vacuum leak? I dont know uless your more specific

Nov 06, 2011 | 2003 Chevrolet Blazer

1 Answer

I have a 2005 Suzuki Aerio. The AC is blowing out air, but it doesn't get cold.


You are most likely not getting any cold air because your A/C compressor is not engaging when you hit the switch. A number of different problems could give you this result.

First, you could have a blown fuse; that would be the cheapest and easiest solution. Second, your A/C system may be low on freon, and a low-pressure safety valve may be keeping the system from operating. However, rather than simply adding some freon to your system, it makes more sense to borrow a set of A/C pressure gauges and hook one up to the low side of your system (i.e., at the port where you would otherwise add R-134a refrigerant) to get an accurate pressure reading. A slightly low reading indicates that natural wear and tear on the system has let enough of the R-134a out of your system that it needs to be replaced. However, an inappropriately high or low reading not only indicates that you're low on freon, but also that there's a more substantial leak somewhere in your system. In this situation, adding refrigerant without addressing the leak may damage your compressor over time, as crucial lubricating oil drips out of the system and isn't replaced. A third and less likely cause for your problem is that the dashboard switch to turn on your A/C may be broken. This does happen, though if the switch is lighting up when you engage it, it's probably not the problem. Fourth, and most expensive, your A/C compressor may have failed. This would be somewhat unusual in a 2005 car, although it's not out of the question if you have used your A/C system a great deal.

Because of the cost of replacing damaged A/C components, it may make the most sense to let a certified shop handle any A/C system repairs once you have an idea of what's wrong. Full servicing of your system will evacuate all existing oil and refrigerant, identify and fix any leaks, and then vacuum test the system before filling it with fresh oil and R-134a. The end result will very likely work better and last longer than the cheap fix of dumping a can of R-134a into the system and hoping for the best.

A number of years ago, I lost all freon and pressure in my A/C system when a rock kicked up from the street hit the A/C cooling condenser and caused a pinhole leak. I couldn't find the leak; I only knew that my A/C system had lost pressure. That's the kind of problem that an A/C service center will be able to diagnose and fix much better than someone without the right equipment.

Jun 01, 2011 | 2003 Suzuki Aerio

1 Answer

How to fix my 2003 Mitsubishi Montero is overheating problem?


May want to have a shop do a pressure test on your cooling system. I had a vexing overheating problem that two shops misdiagnosed and "repaired" $$. Turned out the radiator had a leak that only occurred under pressure, and finally was revealed when the leak became obvious, and then did the replacement myself. Good luck.

Dec 27, 2010 | 2003 Mitsubishi Montero

1 Answer

Leaking antifreeze, but not from the water pump? fluid is rust colored.


What you do is pressure test the cooling system. The pressure will cause fluid or air to come out at your leak. The rust does not sound good. Fix the leak (s), flush system, and replace coolant. Consider "mechanic in a can" rust inhibiter, but stay away from stop leak, fix leaks properly. the cooling system just need to work correctly, it builds up near 15 lbs of pressure and stop leak cannot properly stop that pressure.

Dec 18, 2010 | 1987 Nissan Pickup

1 Answer

My wife's Suzuki Vitara (GV 1.6, 2003) is losing water and we cannot find any sign of an external leak. Someone suggested the head gasket is the problem but my mechanic is very doubtful about that but is...


Pressure test the cooling system. The head gasket possiblity can be tested with dyes, or testing for exhaust gases in the cooling system.
What happens in this case is combustion gases escape into the cooling system and push coolant out, usually when under load, driving...If this is what is happening, the fix can be fairly costly.

Sep 16, 2010 | 2003 Suzuki Grand Vitara

1 Answer

Radiator is leaking


Hi: To make Sure its your Radiator and Not Your Lower Radiator Hose or Water Pump. With the Enging Cooled down, Fill it all the way up, Raise the Front of your Blazer, Support it with Jack Stands. And Start Engine, Slide under the Front of your Blazer With a Good Bright Light and You Should Be able to Pin Point Your Leak.If it is your Raditor I would Either Check the Price on Repairing you Radiator Or Check your Local Auto Supplier for the Cost of A Reconditined Raditor or A New One. Hopefull you Find that its Your Lower Radiator Hose,Or some A Lot Less Expensiove.You can Also Rent a Cooling Sytem Pressure Tester ,with this it Attaches at the Same Place your Radiator Cap Does. You Pump it up Cold Or Warm to the Correct Pressure ,Get Specs From Your Parts Supplier or Dealer.Don't Over Pressurize your Cooling System. This will give you the Same Pressure If you where Driving It Under Normal Tempeture. I'm Sure You'll Find Your Problem, Let Me Know Please By Voting and Also Write me a Testamony on the Quality Of Solutions I've Given You.Any Other Problems Just send a Message Thru FIXYA and i'll be Glad to Further Help You. Thanks The WYOCWBOY

Jun 02, 2010 | 2000 Chevrolet Blazer

1 Answer

Overheatin an leaking engin coolant


i need to know more about the leak but that is why it over heats the coolant system depends on pressure in the system to keep temp at 198-212 degrees if pressure is released temp goes up once the leak is repaired so is the overheating

May 03, 2010 | 2003 Chevrolet Blazer

2 Answers

AC not cooling in '98 blazer


I think you have a leak. I would get some dye . The local auto parts store sells it with a black light. Then check for leaks .

Good luck

Jul 14, 2009 | 1998 Chevrolet Blazer

1 Answer

Overheating from leak not visible


Hook up a cooling system pressure tester. If you have a pin point leak, the pressure from the tester will shoot coolant out of the leaking area.

May 07, 2009 | 2003 Honda Civic

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