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What is a simple chemical block test to confirm a head gasket issue?

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Well now, that's a quetion with many answers but here are a few videos for the DIY or Do It Yourselfer... The second one might be more descrptive but both are answers.
HOW TO CHECK FOR BLOWN HEAD GASKET How to Test Head Gasket

Posted on Dec 06, 2016

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On a 4.3l chevy V6should you check the block for cracks when you have head gasket leaking to a cylinder ,which comes up sometime ? Are the chemical crack test kits worth the money ? I ask because I di


head gasket probs. usually involve the head. a machine shop will check the head for damage & if ya gonna tear it apart or rebuild the engine, take the block to them too

Feb 01, 2015 | 1999 Chevrolet S-10 Pickup

1 Answer

I have a 3800 series engine, I know there is a leaks in the intake manifold but how would you determine if your heads or if you have a crack anywhere?


For now you know the Dex-Cool ate the intake gaskets,
so off with the intake

There are newer gasket materials out for that issue &
I would pick a different coolant

If you read ALL the coolant bottle labels, you can find, in any
store,they ALL are Dex-Cool chemicals

There is no more old green coolant & NO one size fits all
Prestone is just dex-cool & lots of non-sense on the labeling

I would use Zerex G-05 even though it is for ford & chry & others

Still have the same engine block,heads,heater parts,radiators, on all
vehicles,so it won't hurt anything, if you use ONLY distilled water &
coolant.

Do a cylinder leak down test first, to confirm proper valve
sealing & hopefully good head gaskets

Going to need new oxygen sensors, once the repairs are made.

I would pull the injectors & mail away for Ultra-Sonic Cleaning

They are 16 plus years old & no other cleaning will do a thing.
They are too old to use & not be tested & cleaned off vehicle

Sep 26, 2014 | 1998 Oldsmobile Regency

2 Answers

Water coming out of my exaust water vapor and water reserve has to be refilled often


Unfortunately, it sounds like you have a cracked block. To verify this, you can buy a test kit at most autoparts stores.

Jan 25, 2012 | 1990 GMC Sierra

1 Answer

My Forester loses water from the cooling system. There are no leaks and pressure testing didn't show any loss of pressure. The engine is inclined to heat up when going up long hills.


one of 4 things can cause this. A thermostat that isnt opening all the way. A water pump that the blades (pump) is wearing out from corrosion, a restricted coolant system like maybe the radiator. A small head gasket leak. To rule out the head gasket as the issue have a smog machine sniff the coolant fumes for gasoline (hydro carbons), or have a shop do a chemical block test. Takes about five minutes for each test.

Jun 26, 2010 | 1998 Subaru Forester

1 Answer

Heats up while going uphill Have replaced the fan clutch.thermostat(within the last month) and the radiator(4 yrs ago)


you need to remove the water pump and inspect. The blades can corrode. If everything in the cooling sysyem is deemed good and you verified it really is over heating using an infrared temp gun then the only other option is a small leak in the head gasket. Have a shop do a chemical block test to confirm. This test can check to see if any gas has gotton into the coolant by way of a failed headgasket.

Jun 23, 2010 | 1996 Dodge Dakota

1 Answer

My rodeo overheats while driving,but not while it idles in park,no coolant leaks visible . I add water because it comes out the overflow. It does'nt overheat every time, but most of the time it does.


this all points to a head gasket issue or a weak water pump or a clogged radiator, or a weak radiator cap' Or a thermostat that isnt opening enough.

A simple chemical block test will confirm a head gasket issue.

A infrared temp gun can test different areas of the radiator for cold spots.

If these turn out ok then I would inspect the water pump impellers and replace the cap and pump if necessary and replace the thermostat.

Feb 11, 2010 | 1998 Isuzu Rodeo

2 Answers

My 97 blazer overheated and stalled out on me. steam was rolling out of the engine and I let it sit for the night. the next day i went to start it and it took a little while for it to start. i had to give...


Sounds like a blown head gasket or cracked head. Usually about $800 Easiest to swap out Engine and trans. Don't try to fix get a wrecker motor/trans and be done in a day with gurantee

Feb 03, 2010 | 1999 Dodge Durango

1 Answer

Wont stay running if is its idealing rough and discharging thick white to grey smoke


HI. This white to gray smoke will be a strong indication of a rupture within the block seal(head gasket). Generally, when the head gasket ruptures, or shrinks, this will introduce coolant into the cylinder chambers, thus, inducing the burn - off affect. This issue will cause the discharge of the white to gray smoke you are noticing at this time.

The head gasket must be inspected, along with the intake manifold gasket for visible damage, ro leaks. The leaks may not be noticeable from the outside if the gaskets if the rupture is internal. Due to the fact that you do have discharge, this will confirm that the gasket has failed.

I would advise to perform this test. Kindly pull one spark plug away form the head, and crank the engine. You will need an assistant to observe the spark plug hole for coolant spillage. While you are cranking the engine, if the assistant notices that there is coolant spillage coming out of the hole during the cranking process, this will confirm that the head gasket has rupture. Another indication of gasket failure will be the rough idle. A rupture gasket will induce low compression, thus, affecting the combustion rate of the engine. You can confirm this by having the engine bock pressure tested.


NOTE_ IF your check engine light is on, have the codes pulled asap.

Jan 11, 2010 | 1998 Dodge Ram 1500 4WD

1 Answer

I have a coolant leak in my 1995 camaro. The mechanic said it was where the timing cover meets the block. He said it looks like a gasket, and it is a hugh job to fix. What should I do?


It sounds like a head gasket.Do you overheat? Boil Over? If you do it is the head gasket.It is a big expensive job.There are sealers I have used available only online Seal a Head worked great.There is a test called an Engine sniffer that can positively confirm a bad head gasket.You must confirm.Look for my response on other overheating,Head Gasket issue on this site.Good Luck.

Sep 21, 2009 | 1995 Chevrolet Camaro

1 Answer

Honda d16a6 cyl head on d16y3 block possible


Do the block chemical leak test and coolant pressure test to rule out blowning head gasket.
Check all freeze plugs to rule out coolant leak on the hot engine block.
Check for any hose leak.


Start monitor for coolant and oil lose.


Apr 13, 2009 | 1996 Honda Civic

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