Question about 1998 Chevrolet Blazer

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1998 Chevrolet Blazer, new water pump, new thermostat, new fan, new clutch, a complete back flush. Engine roars on acceleration when cold, sometimes when warm. What could be the problem?

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Fan clutch its normal

Posted on Oct 04, 2009

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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

I have put on a new water pump, fan clutch, fan blade, new thermostat, flush radiator, new coolant and a new cap. and truck is still reaching a temperature to where the truck will start getting a bad ping...


HI sheppard308 NO you do not need to replace fan clutch .
IT sounds like the problem is your fuel octane is too low .
TRY using a higher octane fuel and or octane boost .
this should your solution good luck let me now what happens

Aug 04, 2011 | 1993 Mazda Navajo

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I have a 2002 4x4 Grand Cherokee Laredo 6 cyl. automatic. Engine sounds like the engine is idling high but it is only 700 RPM.at idle. Does this sound like a harmonic balancer?


It may be the radiator fan making all that racket. Usually when the engine is cold, the thermal fan clutch allows more "slip" --- this allows the fan to turn slower than the water pump pulley (less load on the engine). When the fan clutch detects more engine heat, it reduces slippage of the fan clutch and this results in the fan turning "faster". It's actually turning at the same speed as the water pump pulley. The "roaring" noise is the result of the fan pulling in more air through the radiator.

If the noise is present at all times, whether or not the engine is hot or cold, then the fan clutch might be malfunctioning.


I hope this helps.


Have a nice day !!!

Apr 08, 2011 | 2002 Jeep Grand Cherokee

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Temp gauge is in normal, 200 degree, range when starting. Within a few minutes of driving goes up to 250, right below orange line. No leaks found, coolant level appears fine. Any ideas?


250 DEGREES ENGINE GETTING TOO HOT.SOUND LIKE CLUTCH FAN FREEWHEEL.IF CLUTCH FAN DONT LOCK IN OR HAVE RESISTANCE TURNING BY HAND WHEN ENGINE HOT.FAN CLUTCH IS BAD.IF FAN CLUTCH OKAY COOLANT LEVEL CORRECT.I WOULD CHANGE THERMOSTAT FLUSH OUT ENGINE AND RADIATOR.IF ENGINE TEMPERATURE STILL READS 250 DEGREES OVER FLOW JUG OR RESERVOIR NOT BOILING OVER THE COOLANT TEMPERATURE SENSOR FAULTY.

Nov 05, 2010 | 2003 Chevrolet Avalanche

1 Answer

2000 EXPEDITION OVERHEATING 4 MILE AFTER LEAVING HOME NEW RADIATOR, FLUSH, AND NEW THERMOSTAT I DON'T KNOW WHAT THE PROBLEM IS


Here are a few things to try. Check your Radiator cap pressure as a weak cap will boil over more quickly. Replace your Temperature sending unit. There may be 2, one is for the dash gauge and the other is for engine control. Unless you have other signs of overheating you may not be overheating at all, just a bad sender.

Next, the cooling fan clutch is what the fan blade is mounted on. This is checked by using a Timing light with a RPM tach made into it. The fan clutch "locks" at a variable temperature. In cold weather it slips internally. In hot weather it engages or "locks". A mechanic measures the RPM of the blade to the RPM of the engine. This tells if the fan clutch is slipping too much internally.

Before considering a new water pump try a free scan at Autozone or Oreillys. If your Catalytic converters are plugged the engine will overheat. You should have a Code for this problem in the onboard computer. About all you can try after this is to remove the Thermostat completely and see if the engine still overheats.

You will have to replace the New Thermostat again because the other engine controls will not work right without it. But without the thermostat you can test for collapsed Radiator hoses at say 2500RPM or above. Thats about all I can think of, the water pump would cost the most. The cap, sensor-sender, fan clutch, and hoses are not that expensive.

Aug 12, 2010 | 2000 Ford Expedition

1 Answer

No heat on 1999 blazier


Water pump may be worn and needs to be replaced. You can try flushing out the heater core it self buy disconnecting the two heater hose from the water pump and flushing water through it to get any restriction out. Once you flushed out the heater core, reattached the hose at the water pump and see if that helps. If not then your going to have to replace the water pump it self. Good luck

Dec 10, 2009 | 1998 Chevrolet Blazer

4 Answers

Loud accelerating whining


It is the bearing in the idler pully. about $35 and 30 minutes of work and its fixed.

May 20, 2009 | 2006 Chevrolet Trailblazer

2 Answers

Water not circulating,we put on radeator cap water pump ,intake gasket,flush heater core,engine radeator,reservoir


check to make sure the bottom radiator hose is not collapsing. sticking together. once it sucks together its like the thermostat being closed. the faster the engine turns the it sucks together. also make sure its not the clutch on the fan gone bad. if it has one. to ckeck ,look under hood at fan ,have someone to rev engine. make sure the fan turns as fast as the engine turns . if it doesn't it's a bad fan clutch. goe put a new one on.

Apr 21, 2009 | 1993 Chevrolet Lumina

2 Answers

Car over heat


Hi,

Possible causes of overheating are:
  • stuck thermostat. In my country, some mechanics even remove entirely the thermostat (not applicable on cold weather);
  • faulty water pump;
  • too soft radiator hoses (upper and lower);
  • faulty/slow radiator fan. Again, in my country, some mechanics hard wire the radiator fan to be always on when the engine is running. In some cases, it could be the fan clutch.
This is of course assuming that nothing is internally wrong with the engine, the coolant level is as required and that there are no leaks, air bubbles and the belt driving the water pump is mechanically sound. In most vehicles, the radiator fan will not work if the A/C or heater is not working.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Oct 01, 2008 | Toyota 4Runner Cars & Trucks

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