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Blazer Engine Temperature Questions

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

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#1 of 28 '02 Blazer Temperature Problems by hollygee May 17, 2009 (2:19 pm)
Hi. I bought an '02 Blazer about 2 years ago. At that time it only had 68,000 miles. Now it has 84,000. Everything seemed fine for the first year. It was a great truck. Now all of a sudden everything seems to be going wrong all at once. My driver's side window no longer works, my back hatch will not open (no matter which button you push, key ring button, dash button, or hatch button), my key cannot come out of the ignition properly (I have to put a screwdriver in the emergency release button underneat the steering wheel shaft to release my key once in park), my heat just went out, and now my temperature keeps spiking when I drive anywhere more than 20 minutes away. I have to pull off the side of the road and wait 15 minutes before starting the engine up again. I changed the thermostat yesterday. It really needed to be changed (it was very rusted out), and I thought that would fix the problem, but I am still experiencing temperature problems. I guess my main question is what is the NORMAL running temperature for a Chevy Blazer? Below 210? Right at 210? I just want to fix the problem before I cause a much more expensive one, such as blowing a head gasket. Thanks for your time. Replies to this message: jlflemmons (May 17, 2009 4:25 pm) rs53 (Jul 22, 2009 6:18 pm) melm813 (Jul 02, 2009 5:19 am) jlflemmons (Jul 04, 2009 2:00 pm)
#2 of 28 Re: '02 Blazer Temperature Problems [hollygee] by jlflemmons May 17, 2009 (4:25 pm)
Replying to: hollygee (May 17, 2009 2:19 pm) Normal running temp is 195, or just below 210 on your temp guage. If the thermostat was that nasty, you need to have the entire cooling system flushed and refilled with fresh Dexcool or equivalent. DO NOT use the green ethylene glycol antifreeze as this will cause problems when it mixes with the long-life antifreeze.   It sounds like the cooling system had not been flushed before.   With regard to the hatch, there is a solenoid in the tailgate/liftgate that actuates the latch. If none of the switches will open the latch, it sounds like the solenoid has either gone bad, the connection to the latch has broken, or the wiring is damaged. Check your fuses to be sure the fuse to the solenoid hasn't blown. The owners manual will show which one to check. Replies to this message: rs53 (Jul 22, 2009 6:18 pm)
#3 of 28 Re: '02 Blazer Temperature Problems [hollygee] by melm813 Jul 02, 2009 (5:19 am)
Replying to: hollygee (May 17, 2009 2:19 pm) i have an 04" i bought it with 20k ,,it runs JUST below 210 it has always run hot nothing makes it run cooler....makes towing a challenge Replies to this message: jlflemmons (Jul 04, 2009 2:00 pm)
#4 of 28 Re: '02 Blazer Temperature Problems [melm813] by jlflemmons Jul 04, 2009 (2:00 pm)
Replying to: melm813 (Jul 02, 2009 5:19 am) The correct thermostat for these engines is 195d. Running without a thermostat, or one that opens too soon, will set a check engine light on the 2002 and newer. On the older 4.3, it won't set the CEL, but will affect fuel economy.   195-225 on this engine is no problem. If you see the temp creeping upwards at idle, check the fan clutch. Just had one go bad on my '02. 195d if moving more than 25mph, 220d when sitting still. After repair, solid 195d regardless, and this is in ambient of 107!
#5 of 28 Re: '02 Blazer Temperature Problems [jlflemmons] by rs53 Jul 22, 2009 (6:18 pm)
Replying to: jlflemmons (May 17, 2009 4:25 pm) my 96 blazer runs at 198 when it's rolling but when it's at a stop light the needle goes up to 218 then it repeats itself each time on stop and go situation. Is this normal or is there something wrong? it never done this before it normally stood below the 210 mark. I replaced the fan clutch and thermostat
#6 of 28 help with a cooling problem by rs53 Jul 22, 2009 (6:25 pm)
my 96 blazer runs at 198 when it's rolling but when it's at a stop light the needle goes up to 218 then it repeats itself each time on stop and go situation. Is this normal or is there something wrong? it never done this before it normally stood below the 210 mark. I replaced the fan clutch and thermostat Replies to this message: jlflemmons (Jul 22, 2009 7:26 pm) rs53 (Jul 23, 2009 3:05 pm) jlflemmons (Jul 24, 2009 8:39 am)
#7 of 28 Re: help with a cooling problem [rs53] by jlflemmons Jul 22, 2009 (7:26 pm)
Replying to: rs53 (Jul 22, 2009 6:25 pm) What is the ambient temp? If well over 100 (as it has been around here) that wouldn't be too unusual, especially with the AC running. But even 218 is not excessive for an engine. Remember, the cooling system is under pressure, so the boiling point is higher.   Is your coolant/water mixture 50/50? The coolant provides the anti-corrosive and antifreeze properties. The water is the better heat disipator. Straight coolant will not keep the engine as cool as 50/50. Replies to this message: rs53 (Jul 23, 2009 3:05 pm) jlflemmons (Jul 24, 2009 8:39 am)
#8 of 28 Re: help with a cooling problem [jlflemmons] by rs53 Jul 23, 2009 (3:05 pm)
Replying to: jlflemmons (Jul 22, 2009 7:26 pm) The coolant is 50/50 mixture. I was told the check the radiator temp. in various spots with infrared temperature gun. it varied about 18 degrees the bottom being the cooler part of the radiator. so my next step is to flush it to see if it makes a difference. Replies to this message: jlflemmons (Jul 24, 2009 8:39 am)
#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)

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