Low engine temp - Team Camaro Tech
Tech 2002 General Tech questions from 2002
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post #1 of 10 (permalink) Old Nov 3rd, 02, 05:39 AM Thread Starter
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Location: milwaukee, wi, usa
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Well Just got an exhaust system put on my 67, (ZZ4) and put a few miles on it, but it seems the temperature guage will not go any higher than 150-160. I have an Autometer Ultra Lite electrice temp guage, sensor in the drivers side head, and I have tested the thermostat to make sure its opening. I have a new Griffen aluminum radiator. Is this normal? When we first started the motor and ran it to during the initial break-in time, it did read higher, almost 200, but since it doesn't seem to get any higher than 150-160 at the most. Now this is only driving about 10 miles at a crack, but the car should be at a warmed-up operating temp by then shouldn't it? Do I have a problem? I don't think so, but thought I'd ask anyway.
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post #2 of 10 (permalink) Old Nov 3rd, 02, 07:47 AM
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If you have a 12volt power supply or spare battery, set up an experiement. Take it all into the kitchen and put the sensor in a pan of boiling water to see if you reach 212 on the meter.

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post #3 of 10 (permalink) Old Nov 3rd, 02, 10:53 AM
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It's important that you have a full 12 volts to the instrument to make it reference correctly. Some instrument feeds off the fuse block can be low, but usually only when the alternator is lacking and not charging. I don't think this is the case with yours but check to make sure.

As you have been told by a previous poster, you can calibrate the gauge but you can do this on the auto if you want. You do this by removing the sensor, leaving it wired to the system, boil water on the stove, prepare a simple jumper wire to ground to make sure the sensor will be grounded (alligator clip to ground to the threads), remove the pan from the stove and quickly but oh so carefully sit the pan on the side of the engine and dip just the end (to the threads)of the sensor and have your helper turn the ig on and watch the gauge. It should come in around 200+ degrees.

Beyond that, do you have a thermostat with holes in the center for high performance water pump usage? If so, there is enough water going thru to keep you that cool probably. My engines run about 15 degrees below the thermostat reading in cooler weather due to this aspect of a holed thermostat.

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[This message has been edited by HOTRODSRJ (edited 11-03-2002).]
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post #4 of 10 (permalink) Old Nov 3rd, 02, 08:18 PM
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my temp guage reads around the same temp in my 84, only since i put in a thermostat 195 deg. and a new radiator cap and fluched the system. is it abnormal for those temps?

1984 Chevy Camaro (305)
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post #5 of 10 (permalink) Old Nov 4th, 02, 05:52 AM
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67killerb - what are the outside air temps during these short 10 mile runs? If the temps are cold it may just take more time to overcome the cold and warm up.

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post #6 of 10 (permalink) Old Nov 4th, 02, 03:23 PM
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while on the topic, i mentioned that my temp doesnt ever get above 195 (my thermostat temp) will this affect the TVS (Thermal Vacuum Switch) temp? what is the TVS shutoff temp anyway? my efe valve stays closed because my TVS doesnt close im assuming it is a bad TVS on the otherhand i was wondering if my engine temp just isnt hot enough to shutoff the TVS? my outside temp has only been at lowest 40 deg.
my thermostat is new 195 deg

1984 Chevy Camaro (305)
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post #7 of 10 (permalink) Old Nov 4th, 02, 03:45 PM
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What rating thermostat are you using? If it's a 160 and your cooling system has enough capacity (especially with cool ambients this time of year in your area) to cool below its rating, it will run at 160 all the time; thermostats determine the MINIMUM operating temperature. If it's a 160, that's too cool anyway - it won't get hot enough to boil off moisture, condensates, and blow-by contaminants in the oil pan.

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post #8 of 10 (permalink) Old Nov 4th, 02, 07:38 PM
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its a 195 degree thermostat...i did fint out however that the TVS requires 90 degrees in order to close, and after testing the TVS in heated water to simulate the coolant, i found it is the tva that is bad, it does not close

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post #9 of 10 (permalink) Old Nov 5th, 02, 11:16 AM
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150 to 190 is normal. are you sure that your thermostat in'nt opening too soon? I would get a new thermostst with the same temp range as the one you have now and compare the results.
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post #10 of 10 (permalink) Old Nov 5th, 02, 06:36 PM
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well i guess i should wait until i perform all test before posting...BUT! my local chevy dealer had ordered me a new tvs today ($22.00) i dont think thats bad, anyway i put the new tvs in and waited for the engine to heatup and observed the EFE valve open up as soon as the coolant temp reached approx. 80-90 degrees, so thaat made me happy. im getting better at this trouble shooting stuuf...might i add ive got the best help a man could ask for -Team Camaro. Thanks

1984 Chevy Camaro (305)
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