Question about 1987 Chevrolet Blazer

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Changed head gasket battery and alternator on 1987 K5 blazer when I crank truck runs alright when cold once engine heats and thermostat opens and rev engine it breaks up cut it off and try to start it again the battery want turn it over let cool and it will start again

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This sounds like an ignition timing issue. Check it with a timing light or take it to a tune-up shop.

Posted on Nov 19, 2014


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1987 Chevy k5 Blazer, heats up. The manifold gets a cherry red, and the plug wires started to melt.

check the timing of the ignition as hot exhaust is a good indication of retarded ignition timing. Fire coming out past the exhaust valves because the mixture ha been ignited too late. Have this check out fast as you run the risk of burnt valves . The timing should be about 12 degrees before TDC not 12 degrees after TDC. IT will be the cause of the engine getting hot as well.

Jan 07, 2014 | Chevrolet Blazer Cars & Trucks

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Van blowing cold air

It has air in the line. let ir idle with the radiator cap off for a little while and the air will work its way out. You may have bigger issues, but I do not think you need to clean heater core because you get heat sometimes. Do you see a lot of bubbles when you take the radiator cap off when running, head gasket if so.. You can take the cap loose while the engine is running, but not after you stop it, it will be to hot. Good luck

Nov 11, 2017 | 2002 Chevrolet Venture Passanger

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You have a head gasket problem with the engine generating abnormal pressure, and sending all the antifreeze to the reservoir, thereby leaving the engine running dry; it is dangerous for the water pump to operate with no water.
Drill 3 11/64 or 3/16" holes in the thermostat side facing the engine, making sure not to touch the opening mechanism; this will keep antifreeze always running thereby, compensating for the abnormal pressure regenated by head gasket leak(s).
Your thermostat was never your problem.
In cold weather, 5 degress celsius or under, the thermostat takes longer to open and more antifreeze will be sent to the reservoir leading to an overheating.. Partially cover the radiator with a sheet metal piece to make the thermostat open faster and stay open, as the antifreeze is not being cold that much by cold air. You're fooling the cooling system into warm weather driving.
Don't waste your money buying radiator stop leak or liquids to repair head gaskets; this will only corrode and make your radiator to eventually leak.

Dec 29, 2012 | 1997 Oldsmobile Silhouette

1 Answer

Overheating problems for 1987 chevy K5 Blazer

Is it possible the replacement engine has a water pump that turns the opposite direction from the original ?
The thermostat has to be open to allow flow thru the radiator, have you tried running without a thermostat to check flow ?

Jul 24, 2012 | Chevrolet Blazer Cars & Trucks

1 Answer

On my 1994 Chevy S-10 Blazer 190,000 miles the engine stalls periodically

Please keep check on the coolant level, in morning on first start when radiator is still cold open the radiator cap and rev the engine. Notice if there are bubbles and oil drops. I am suspecting head gasket leakage.

May 21, 2011 | 1994 Chevrolet S-10 Blazer

1 Answer

1987 k5 blazer dies during driving

Make sure your battery is secured by a good battery hold-down system...if the battery shifts in the tray and the positive terminal touches the fender, the dead short will immediately kill the vehicle.
Also, take the alternator to a parts store and have it tested if your battery is held down firmly. The whining noise can be bad alternator bearings. On a vehicle of this vintage, this is a possibility for the noise. It is furthermore possible that the alternator has died electrically, and during a lengthy drive, the vehicle's own electrical consumption will drain the battery and the vehicle will die en route.
When you jump it off, it gets enough charge from the donor vehicle to drive, but if the alternator is dead, it can't keep the vehicle supplied with enough energy to operate.

Feb 14, 2010 | 1987 Chevrolet Blazer

1 Answer

87 Chevy K5 Blazer engine won't fire, but revs when trying

If you had water on your distributer I would personally pop that off and check inside to see if there is a little moisture in there. It almost sounds like there is

Jan 03, 2010 | 1987 Chevrolet Blazer

1 Answer

My 98 honda accord wont stop over heating,ive changed the thermostat

when engine is cold top it off leave cap off and look for bubbles right after you crank engine to see if so head gasket is leaking combustion into radiator

Jul 11, 2009 | 1998 Honda Accord

3 Answers

I have a 94 toyota pickup 22r engine--the engine revs up and down when ideling and is going thru alot of antifreeze--i live in alaska so its always cold--and now the heater is running cold air here and...

I think the problem is your IAC valve under the throttle plate. What happen is the water passages gets blocked and does heat up the idle air pass through. This procedure is part of regular tune-up according to service manual.

Mar 11, 2009 | 1994 Toyota Pickup

1 Answer

Coolant issue with 1997 blazer

check to see if you have a leak in your heater core,and if the heater core is not leaking you might have a leak on the intake gasket or the head gasket

Jan 03, 2009 | 1997 Chevrolet Blazer

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