Question about 1998 GMC Blazer

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Overheating when going slow up steep grade - 1998 GMC Blazer

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Hello Guest and thank you for asking your question, on Fixya.

Here is a simple process that will walk you through a few steps that will pinpoint the overheating problem on your 1998 GMC Blazer, without even using any tools. It has helped millions of people, and I am certain that it will help you, because I wrote it for people in your exact situation.
How to diagnose your overheating 1998 GMC Blazer

Get more great (money saving) tips and tricks about your vehicle from: twitter.com/acoates23234

Thanks for the vote, and good luck!

Posted on Dec 27, 2010

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Posted on Jan 02, 2017

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Overheating especially on steep grades. Runs pretty hot most of the time when it used to have needle on gauge in center. replaced Thermostat with no change at all, also did cleaner flush and replaced...


try taking out the thermostat and running without it, also take lose all the cooling system hoes es and running straight water through it to clean out your cooling system.

Nov 11, 2012 | 1984 Toyota Pickup Deluxe

1 Answer

1998 toyota hilux 3l diesel overheating when goin up long steep hills.


if its not going int o red zone it is normal to get hotter as she climbs hills

Oct 15, 2012 | Cars & Trucks

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I have toyota axio g grade 2007 december car.what does it mean S & B in gear system.


The short answer:

S is for low speeds with quick pickup.
S is not economical. Thats why the eco light is off.

Use B when you're climbing down steep hills and needs to slow down without overheating the brakes.


The long answer:
  • Brake (B)A mode selectable on some Toyota models. In non-hybrid cars, this mode lets the engine do compression braking, also known as engine braking, typically when encountering a steep downhill. Instead of engaging the brakes, the engine in a non-hybrid car switches to a lower gear and slows down the spinning tires. The engine holds the car back, instead of the brakes slowing it down. For hybrid cars, this mode converts the electric motor into a generator for the battery. It is not the same as downshifting in a non-hybrid car, but it has the same effect in slowing the car without using the brakes. GM called this HR (hill retarder) and GR (grade retarder) in the 1950s.


S has 2 possibilities

  • Second (2 or S)This mode limits the transmission to the first two gear ratios, or locks the transmission in second gear on Ford, Kia, and Honda models. This can be used to drive in adverse conditions such as snow and ice, as well as climbing or going down hills in the winter time. Some vehicles will automatically shift up out of second gear in this mode if a certain RPM range is reached in order to prevent engine damage. Although traditionally considered second gear, there are other names used. Chrysler models with a three-speed automatic since the late 1980s have called this gear 3 while using the traditional names for Drive and Low.
  • S or SportThis is commonly described as 'Sport mode'. It operates in an identical manner as 'D' mode, except that the upshifts change much higher up the engine's rev range. This has the effect on maximising all the available engine output, and therefore enhances the performance of the vehicle, particularly during acceleration. This mode will also downchange much higher up the rev range compared to 'D' mode, maximising the effects of engine braking. This mode will have a detrimental effect on fuel economy. Hyundai has a Norm/Power switch next to the gearshift for this purpose on the Tiburon. GM also used S to indicate a "super" mode, being the same as the 2 position on a Chrysler, shifting between only first and second gears.


Dont use B or S for general driving as both are very low on fuel efficiency.

Jun 21, 2011 | Toyota Corolla Cars & Trucks

1 Answer

My Landrover Discovery 300tdi 1995, loses power drastically to almost stopping point. failing to climb steep hills and check engine comes on, only going off when I stop accelerating. This has been gradual...


replace ignition coil, spark plugs, also double chek your coolant temperature must be normal. overheating causes car slows down and engine cant handle excessive high temperature or may damage it.

Jan 11, 2011 | 1995 Land Rover Discovery

1 Answer

My compressor on my 2002 sedona is not kicking on. I am not low on freon, could you please help with a solution? Thanks


if the temp sensor is sending a sinal that the vehicle is overheating it will not allow the compressor to kick in. this is one possibility. check your owners manuel under a/c to see if there are any other conditions that might do the same .driving long steep grades ,and sitting on the freeway can cause overheating also,when you use your a/c it puts an additional load on your engine. also check your battery a week batery/alternater can have the same effect

Aug 10, 2010 | 2002 Kia Sedona

1 Answer

Overheating when going slow up steep grade


Usually going up steep grades is when the engine is making the most heat as it is doing the most work. That is also when a marginal radiator or improper ignition timing will cause an overheating problem you otherwise would not notice. External or internal obstructions in the radiator can limit its ability to dissipate heat properly. Check that there are no leaves, bugs etc covering the a/c condenser or trapped between the condenser and radiator. Flow is a bit more difficult to check but sometimes you can actually feel spots that are colder than the rest with your hand (not running)
or, shops now use a heat sensing gun to do this. Moderate obstructions will sometimes clear up using over the counter flushes but often they will simply go around the obstructions as the coolant is now doing. In that case, the radiator needs to come out and be flushed at a radiator shop or replaced.
Ignition timing should also give you other symptoms such as "flat" acceleration, loss of performance at high rpms etc. I would be concerned with that only if the radiator checks out as being OK.
You also need to make sure that if you have an electric fan, that it is coming on. If you don't have one, consider adding one as well as an external transmission cooler. Both are "standard" add on equipment for towing, and especially the trans cooler, will help extend the life of your transmission if you tow frequently, transport heavy loads, or just want stuff to last longer.
Good Luck!!!

Mar 21, 2010 | 1998 Chevrolet Blazer

1 Answer

Overheating problem with a 1992 F350


Your truck should have a radiator fan clutch. check it for excessive play or to see if its locked or too hard to spin. i'm thinking this is the most probable cause for your erratic temp fluctuation. If you haven't replaced your thermostat in a while, now would be a good time to do so as well.

Sep 23, 2009 | 1992 Ford F350

1 Answer

96 mercury loses power going up a steep grade


It may be a leaky injector. The injector is connected to the bank. 1 of 2 fuel rails.

Jul 01, 2009 | 1996 Mercury Grand Marquis

1 Answer

Vehicle overhetas on a steep incline


MIne did the same thing it overheated going up in the slighest hill or pulling the littlest of trailers i replaced the radator and now i can go up any hill or pull anything without it overheating,first i changed the thermostat and sensor then clutch fan i even put a aux fan in in ,none of that helped after i changed radiator it did the trick hope this helps my truck was a 95 f350 with a 7.5 460 in it

Apr 08, 2009 | Ford E-350 Super Duty Cars & Trucks

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