Temperature Questions
Thread Starter
Racer
Joined: May 2001
Posts: 262
Likes: 0
From: kingsport,tn,usa
Temperature Questions
hey guys, i have a 79 that i just put on a water pump and 180 thermostat friday.
before, it ran around 220, i figured it was due in part to the old water pump, and the old antifreeze/water.
since i put the new one on, its still up around 220, but the radiator, and the engine was clean, no scaling or anything. what gives?
im gonna get some water wetter i guess, but i thought id ask you guys first
before, it ran around 220, i figured it was due in part to the old water pump, and the old antifreeze/water.
since i put the new one on, its still up around 220, but the radiator, and the engine was clean, no scaling or anything. what gives?
im gonna get some water wetter i guess, but i thought id ask you guys first
Melting Slicks
Joined: Apr 2001
Posts: 2,280
Likes: 0
From: colorado springs CO
Re: Temperature Questions (KrAzYSnIpEr)
220 around town or highway or where???
u have a stock fan/shroud or electric fans??
id say checkout your shroud seals/ fan clutch... if around town...
at highway speed...checkout your radiator seals.....
also could be a non-calibrated temp sensor/guage...
u have a stock fan/shroud or electric fans??
id say checkout your shroud seals/ fan clutch... if around town...
at highway speed...checkout your radiator seals.....
also could be a non-calibrated temp sensor/guage...
Melting Slicks
Joined: Mar 2001
Posts: 3,365
Likes: 5
From: Lake Villa IL
Cruise-In IV Veteran
Cruise-In V Veteran
St. Jude Contributor
Re: Temperature Questions (KrAzYSnIpEr)
Make sure you've bled all the air from the cooling system. This is very important. Put the car on ramps, jack up the front, put it on a hill (front end on the incline), whatever. Just get the front end up in the air. Then, open the radiator cap and start the engine. Let the car idle for 10-15 minutes. Then rev it a bit. Let it rev to about 2500, and keep it there for ten, maybe twenty seconds. This should do it. If necessary, top off the coolant.
If the car still runs hot, check your thermostat. The new thermostat I bought, to replace my "defective" old thermostat, was crap. I took a yeast thermometer, and I tested each thermostat in a pot of hot water, on my stove. I learned quickly that my old thermostat was just fine, and the new one was garbage.
Also, make sure your mixture is okay. Too much coolant will run hotter than less coolant. I actually run straight water, and my car runs in the 160's until I hit the freeway, where it sits at 200 rock solid.
I hope this helps you.
If the car still runs hot, check your thermostat. The new thermostat I bought, to replace my "defective" old thermostat, was crap. I took a yeast thermometer, and I tested each thermostat in a pot of hot water, on my stove. I learned quickly that my old thermostat was just fine, and the new one was garbage.
Also, make sure your mixture is okay. Too much coolant will run hotter than less coolant. I actually run straight water, and my car runs in the 160's until I hit the freeway, where it sits at 200 rock solid.
I hope this helps you.
Melting Slicks
Joined: Apr 2001
Posts: 2,280
Likes: 0
From: colorado springs CO
Re: Temperature Questions (KrAzYSnIpEr)
try a turkey thermometer in the radiator to see what the real temp is at...
im in florida right now and im running about 180........
btw is the sending unit in the head or in the t-stat housing or where?
i think the head temp reads 15 degs cooler or something around that.....
im in florida right now and im running about 180........
btw is the sending unit in the head or in the t-stat housing or where?
i think the head temp reads 15 degs cooler or something around that.....
Heel & Toe
Joined: Oct 2001
Posts: 15
Likes: 0
Re: Temperature Questions (KrAzYSnIpEr)
Very interesting, especially since I am in the middle of changing out my thermostat and water pump. See the comments under the topic "79 Thermostat".
I will be watching to see what you hear on this.
PS. Tennessee also! :crazy:
I will be watching to see what you hear on this.
PS. Tennessee also! :crazy:
Instructor
Joined: Nov 2001
Posts: 175
Likes: 0
From: St Louis MO
Re: Temperature Questions (KrAzYSnIpEr)
check your lower radiator hose, it should have a spring in it and the hose should be firm. If it doesn't have the spring it can actually be sucked closed by the water pump which restricts flow=running hot
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Thread Starter
Racer
Joined: May 2001
Posts: 262
Likes: 0
From: kingsport,tn,usa
Re: Temperature Questions (yogi78)
all your ideas check out, except the turkey thermometer, ill try that,
i cant run complete water because i live in the mountains and it wouldnt be a real nice scene when freeze plugs started to come out.
where is signal mountain? never heard of it, but im in kingsport, n.e. corner of the state, about 100 miles from knoxville
i cant run complete water because i live in the mountains and it wouldnt be a real nice scene when freeze plugs started to come out.
where is signal mountain? never heard of it, but im in kingsport, n.e. corner of the state, about 100 miles from knoxville
Melting Slicks
Joined: Apr 2001
Posts: 2,280
Likes: 0
From: colorado springs CO
Re: Temperature Questions (KrAzYSnIpEr)
okay if it isnt a sending unit/ calibration problem... then try the following.....
radiator blockage??....
carb way too lean (wonder how much of an effect on heat generation that could have??.....not sure about the effects of this one..)
radiator blockage??....
carb way too lean (wonder how much of an effect on heat generation that could have??.....not sure about the effects of this one..)
Heel & Toe
Joined: Oct 2001
Posts: 15
Likes: 0
Re: Temperature Questions (KrAzYSnIpEr)
Signal Mountain is just outside the city limits of Chattanooga. You are 100 miles north of Knoxville and I am 100 miles south of Knoxville. Visit our Corvette club website http://www.rivercitycorvetteclub.com
:flag
:flag
Instructor
Joined: Jan 2001
Posts: 206
Likes: 0
From: Columbia, SC, USA
Re: Temperature Questions (daily_driver)
Listen, I had the SAME problem. Come to find out, I was running 180 to 200 the whole time. For some reason, my gague just reads 20 degrees higher. There is a resister bolted to the back of the gague. Depending on the resister, your gague will read differently. It bugs me that it reads a little high, but I'd bet the house you have the same problem. Take it to a shop and have them shoot your radiator with an infared temp gun. I bet you're running fine!
Drifting
Joined: Mar 2001
Posts: 1,411
Likes: 2
From: St. Louis, Missouri
Re: Temperature Questions (KrAzYSnIpEr)
Aftermarket temp senders seem to be hit or miss. I've had three in my car so far. The original one would show < 160 degrees in the middle of the summer. The first replacement would peg out at 260 degrees after about two minutes of driving. The third one is now indicating low as well.
I'm sure that these senders all have different resistive values. Knowing which one is correct is a mystery. I haven't had any overheating problems so I'm not sweating it (no pun intended) too much. :rolleyes:
[Modified by Neo Fender, 7:26 AM 11/9/2001]
I'm sure that these senders all have different resistive values. Knowing which one is correct is a mystery. I haven't had any overheating problems so I'm not sweating it (no pun intended) too much. :rolleyes:
[Modified by Neo Fender, 7:26 AM 11/9/2001]
Melting Slicks
Joined: Nov 2000
Posts: 2,663
Likes: 3
From: Palm Harbor FL
Re: Temperature Questions (KrAzYSnIpEr)
1) Check radiator seals. These are very important
2) Check fan clutch. When warmed up, turn the engine off and watch the fan. It should only spin 4-5 times before stopping.
3) Check your air dam under the nose and make sure it's there and intact.
If all these things check out, do the turkey thermo to varify the accuracy of the gauge. I don't know how much Water Wetter will help, but I run it in mine and I run 160* on a warm day in FL (160* stat). I credit this more to the seals, clutch, etc. though.
[Modified by 79MakoL82, 2:43 PM 11/9/2001]
2) Check fan clutch. When warmed up, turn the engine off and watch the fan. It should only spin 4-5 times before stopping.
3) Check your air dam under the nose and make sure it's there and intact.
If all these things check out, do the turkey thermo to varify the accuracy of the gauge. I don't know how much Water Wetter will help, but I run it in mine and I run 160* on a warm day in FL (160* stat). I credit this more to the seals, clutch, etc. though.
[Modified by 79MakoL82, 2:43 PM 11/9/2001]
