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Blazer Engine Temperature Questions

28 messages,  Last post on Aug 04, 2009 at 8:29 PM

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#9 of 28 Re: help with a cooling problem [rs53] by jlflemmons Jul 24, 2009 (8:39 am)
Replying to: rs53 (Jul 23, 2009 3:05 pm) The bottom should be cooler. With the return coming in at the top, the cooling fins are doing their job. Flushing can't hurt, but the ambient temp could still be the only issue. Hot is as Hot does!   Is the AC working correctly? Also, check for debris/obstructions between the condensor and the radiator. Over time, grass, dirt, road crud, can work their way into the area between the condensor (in front of the radiator) and the radiator itself. I found this on an S10 that had been used a lot in a hay/milo field.
#10 of 28 STILL HAVING O/H PROBLEMS by rs53 Jul 24, 2009 (7:54 pm)
My question is what do you mean by ambient tempreture? the AC is working good no problem there. I took it to the dealer to get it flush but didn't really want to do it because it may create more problems like open up some little hole in the radiator or possibly start a leak on the intake area. But here's the funny part I explain the problem I'm having also told them that I replaced the Fan clutch & the thermastat and on my request to check everything out to see why it was over heating they also test drove the blazer for 10 miles with an OBD connected with the air on as I did going to the dealer it didn't over heat. They said was working as it should ( the fan & thermostat and the highest it got on them was 210. as I was going home from the dealer it's about 7 miles with the air on It over heated to 246 half way home. since they didn't flush the radiator I did it with a do it your selfer. I bought the kit from pep boys and replace the coolant. I test drove it & again it over Heated to 246. so my next step is to replace the Radiator. It was clean between the condensor & Radiator. Any recommendation as to where to buy a Radiator? Replies to this message: jlflemmons (Jul 25, 2009 4:17 pm)
#11 of 28 Radiator by duntov Jul 25, 2009 (12:42 pm)
I hope you installed a theromstatic fan clutch for a 2002 Blazer with A/C and it turns counter clockwise. AC Delco #15-4684.   If you are going to install the raditor yourself, get the best available which is an AC Delco 20-837 at a retail cost of $309.79.   If you are going to have a radiator installed by a auto repair shop, who knows what radiator you will get. The cheap radiators are nade by "various manufacturers" (meaning Chinese) for $100 plu$ labor. If you have a auto repair shop furnish and install the radiator, you will get one made by "varuious manfaturers" but the radiator will cost the same as if it was an AC Delco radiator. That is the way it works in America. Auto mechanics hate the work they do so they are going to get the most for the work as they can. Fortunately I do most of my own work so I can buy AC Delco or Genuine GM Parts.   Rock Auto Supply has every brand of radiator and price that is available for a 2002, Chevrolet, Blazer, 4.3L www.rockauto.com
#12 of 28 over heating 96 s10 blazer by rs53 Jul 25, 2009 (2:53 pm)
hey duntov how you doing. I try to get ac delco has much as possible for my vheicles 95 percent of the time I do.  outside of the dealers I only found one shop that sells ac delco parts in the phoenix area. I see that you said if I placed a 02 blazer thermostatic fan clutch on my blazer. I did, but I have a 1996 blazer when I standing in front of it the blades are turning counter clock. I also see that you placed a AC DELCO part number for a 02 blazer would you have one for a 96 blazer? I will be installing my own radiator. It seems the last thing left to do to solve the problem I hope.
#13 of 28 Re: STILL HAVING O/H PROBLEMS [rs53] by jlflemmons Jul 25, 2009 (4:17 pm)
Replying to: rs53 (Jul 24, 2009 7:54 pm) Wait a minute. Before the dealer worked on it, 210 was what you were seeing, now your getting 250??? Is the radiator cap on? Something has changed here.
#14 of 28 Fan clutch by duntov Jul 25, 2009 (6:17 pm)
A 1996 Chevrolet Blazer w/AC, V6 eng. (LF6), uses AC Delco 15-4684 fan clutch. The front of the clutch should have one of the following letter codes stamped in black paint: GDL, NK, GAR,or GGK. A fan and fan clutch turns CCW from the front of the engine if the serpentine belt goes over the TOP of the fan pulley because the engine turns CW. Replies to this message: rs53 (Jul 25, 2009 7:53 pm)
#15 of 28 Re: Fan clutch [duntov] by rs53 Jul 25, 2009 (7:53 pm)
Replying to: duntov (Jul 25, 2009 6:17 pm) here is the situation with my 96 blazer I was going to L.A. last friday about 145 miles on the way to LA I had to turn around back to phoenix the temp gage was creeping up toward the red. I pulled over for a bit to let the blazer cool a bit. on the way back to Phx we drove without the air on it held one line above 210 about 80 miles till we hit Phx I put the air on that's when it it started creeping up again this time to the forth line so I turned the air off and it held on the forth line until I pulled in to my drive way & turn off the engine then it went closer the red. so the next day I checked to see what the problem is water pump was moving the coolant with no leak from the pump so I replaced the thermostat (195 degree) and the fan clutch both ac products the fan clutch look just like the old one I felt the tension between the both of them and both felt the same. I replaced it anyway.   then I took it the dealer to get flush out, as I drove it to the dealer it didn't over heat when I got there I explain the problem to the advisor and upon my request I had them check it out to at an extra cost even though they give a visual one free. They test drove it for 10 miles with an OBD meter connected only to come back to say everything was good the tempreture on the OBD stood below 210 but this was around 0730 when the outside temp was around 85 degrees. They also said that if they did do a flush that it may open up another can of worms like creating holes in the radiator or start a leak around the intake or both. so I took it home which is 7 miles away the blazer over heated to the forth line . so the next day I back flush the radiator with a do it your selfer kit from pep boys and change the coolant then test drove it with a OBD meter on it got has high as 246 that's when the check gages light came on for the 1st time. that is why now I'm looking at replacing the radiator in hopes to cure the problem.
#16 of 28 Radiator by duntov Jul 26, 2009 (6:23 am)
My 1991 S10 Blazer has 150,000 miles on it.. I installed a flush "T" fitting in the heater hose at 10,000 miles and every two years the antifreeze has been changed using the most popular "green" ethylene gylcol anti-freeze on the market and we all know what brand that is. I did not need to install the T-fitting because I can drain the coolant by removing the plastic drain cock and then refill the system with fresh antifreeze through the radiator cap. BTW, my 1991 S-10 Blazer has the original AC Delco RC36 radiator cap. The RC36 radiator cap was superceded by the AC Delco RC27 cap about 1995. It was merely a GM part number change and both caps are rated at 15 lb. I see USED AC Delco RC36 caps selling on e-bay for as much as $50 to the Corvette restorers because you cannot buy new AC Delco RC36 caps anymore. If you find a AC Delco RC36 cap in a local parts store or listed from an on-line retailer, it will be a RC27 when you open the box.   Make sure your lower radiator hose has the stainless steel spring inside. If the lower hose does not have that spring, the lower hose could be weak and could be collaping and restricting coolant flow back into the engine.The upper hose does not need that spring because it expands when the coolant returns to the radiator.    I found an AC Delco 15-4630 thermostatic fan clutch for my '91 S10 Blazer on e-bay for $70 with free shipping. I could not pass up that deal but I have not installed it.. The present fan clutch seems to be working as it should but with that many miles the vehicle, the fan clutch is due for replacement .In 100+ degree weather, my S10 Blazer runs at 195 degrees and idles at 210 degrees, with the A/C on . The higher temperature at idle prompted me to purchase the fan clutch, however, 195 - 210 degrees is the normal temperature fluctuation.   According to what you describe, and if there is no coolant loss, your system is suffering from lack of coolant flow. That is because the radiator or the water pump has some form of resctiction and is not allowing the coolant to flow through the system.. Flushing the cooling system does not remove restrictions and does not help lower engine temperature. That procedure is done every one or two years just for replacing the anti-freeze . Replies to this message: rs53 (Jul 26, 2009 2:03 pm)
#17 of 28 Re: Radiator [duntov] by rs53 Jul 26, 2009 (2:03 pm)
Replying to: duntov (Jul 26, 2009 6:23 am) looks like we are on the same page. when I checked everything out there was no build up around the thermastat housing or the lower radiator hose by the water pump. because the blazer is 13 years old with only 59,000 miles. it was not driven as much as it should of. since I changed what I thought would be the obvious things that would cause the problem. the radiator is the last thing left. it may have accumulated some sediment and settle in the radiator between the time it was driven I found a AC delco radiator in phoenix for 333.00 the cheapest I found so when I get it I hope it takes care of the problem.
#18 of 28 over heating by sburguron Aug 04, 2009 (5:26 pm)
help cant figure this out. replaced radiator, thermostat, heating core, water pump , coolant temp unit, flushed system, still over heating oh rad cap too. Replies to this message: rs53 (Aug 04, 2009 5:43 pm) jlflemmons (Aug 04, 2009 5:50 pm)

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