Chevy Silverado and GMC Sierra Radiator and Cooling Questions
bbydolly13
Member Posts: 2
Can anyone tell me why the temperature gauge in my 94 GMC Sierra pickup would shoot way up to the red for a few seconds then go back down really low? I have already had my radiator flushed and filled and thermostat replaced and it had not helped. It doesn't seem to matter if the engine is cold or hot when this happens. Also, since this problem has started my heater doesn't work as well either.
See Also
Why a Temperature Gauge Fluctuates
See Also
Why a Temperature Gauge Fluctuates
0
Comments
I know the water pump comes in two styles a clockwise and counter clockwise rotation. I purchased the clockwise rotation, I believe this is wrong. Can anyone help me.
125, 110, 110, 100, 100, 100, 90 and 90.Does any of this help. Thanks for your help..
Thanks
It has been a very good truck and I like it just wish I knew if it was the intake or something else.
core. Usually thats when you can smell it.
Do you notice any fogging of the windows?
Unfortunately, now most of the cooling system has been replaced, but my truck still overheats. I have replaced the thermostat 5 times, thinking it was bad as it was opening late.
I do know that there were two types of radiator stop leak poured into the system prior to replacing the radiator.
On my way to work in the morning, it is ~32 degrees F. My truck ussually overhearts quickly if I am driving at ~50-60 mph. However, if I take sideroads, I can do 40 mph and the truck will start to climb up to ~210 degrees and if I pull off and let it idle, the thermostat will eventually open and the system will be fine after that.
This typically does not happen on my way home from work no matter how fast I drive. The temps going home are warmer ~40-50.
I just replaced my Radiator cap yesterday, thinking that might be the problem - it wasnt. Then I flushed the radiator - that didn't help either.
If I let the car idle until the thermostat opens every morning, it drives without a problem.
I just can't figure this one out. Is my coolant system clogged or gummed up? Is the coolant mixture bad? I know I used 50/50 premix to fill my radiator last night after I drained it and flushed it.
I have done everything just shy of having my whole system flushed... that was going to be my next step.
Well, after 2,000 miles, it is leaking once again!!
If I recall when looking at the new-style '07 Silverado, I believe they did away with the poor design. Wondering if it the new designed water pump will work on my truck.
Sure don't feel like making a it a habit to have this repaired/replaced at the dealer, especially after the warranty is done!
Anyone else experience the coolant leak as I described? What was done to correct it?
Thanks
So if anyone has slow coolant loss be-aware of the symptoms and you can find out by pulling a rocker cover off. If you got coolant then you have to have new heads. I have 99,300 miles on the truck and the warranty runs out at 100,000 I will most likely purchase an extension since it has more than paid for itself.
Good info to know.
Thanks again
I don't know if the 4.3 is the same as the 5.7 but I have a 99 350 and I have just been chasing a problem with the guage fluctuating as well. I did change the sending unit on the water thermostat housing but have found out that particular sensor runs to the computer (2 wires). Look at the side of the engine heads between the plugs for another sending unit. It will be the unit with 1 wire and it will send the information to the guage. Hope this helps.
I had a similar problem in my 2002 Altima. The sound of swishing water was quite loud. It turns out there was a very small leak in the radiator. The leak was so small the radiator fluid would evaporate before dripping onto the ground, so there was never a puddle underneath to tip me off to the problem. Apparently, when there is a leak, the cooling system wouldn't hold pressure and an air bubble would form in the system. The bubble wants to rise to the top of the system, which is the heater core inside the pasenger cabin. The bubble would create a condition like vapor lock that can occur in a fuel system. Anyway, long story short, once the radiator was replaced no more swishing sound and all is well.
I'd have a pressure test run on the cooling system.
1offroader
Thanks again
been awhile since i last posted..silverado 1500
5.3, 4wd just ovrheated..pulled over to check things out and added some water and it seems to be pouring out the backside of the engine..not dripping put a gallon in and its out in less then 30 seconds.....both sides,passenger and drivers side..tough to see but either its on the heads or just below on the block....havent done a freeze plug in 15 years..do they still have them on the back of the block ,,2 at once tho???
even if its a head gasket..both at once??
and my big question here is do blown head gaskets always leak into the oil to show that white filmy telltale sign...engine runs great..no skips or stalls..was only 2 miles from home so i filled it and drove away and the temp gauge went up then down and then blew warm heat then back to cold..
i'm an old timer and just like tinkering with 70's and pre 70's engines,would there be any other coolant lines on the backside of the engine that might cause the leak?
thanks for any help!!
thanks
Thank you!
I recently disconnected and bypassed the oil cooler hoses from the radiator while troubleshooting a curious high oil pressure indication. When I went to reconnect the hoses I found the lower fitting on the radiator stripped (the radiator was replaced several years ago, too late to raise a warranty/installation issue).
The nut that threads into the radiator is fine.
My question is...is the female thread in the radiator an insert, sort of like a helicoil, or is the thread milled into the radiator body?
I'd really prefer to not have to put in another new radiator.
Any ideas?
Thanks!
For several months,I have been smelling antifreeze,ever now and then seeing a small amount on the driveway.
Just the other day saw a leak from the heater core area by the hoses.
Not the hoses;but a small 90 ell shaped rubber hose.I think maybe a drain to release coolant mix if the heater core was leaking.
Has anyone seen this?Is there a way to stop a small leak?
Maybe some type of stop leak?