Lt1 Getting hot

[9t8z28]

O.K., I just ran into the same problem after installing new cylinder heads.

I had a large amount of air trapped in the system and it would not bleed out. I ran the car for about 45 minutes off and on. I would let it cool off and then start it again.

Finally I got the idea to jack up on the left rear side of the car so that the air could escape. As soon as I did this the air bled out and the temp dropped instantly.

Give it a try.

[ls1_02]

wow there is no way you should be runnin that hot. what thermo did you get? takin thermo out is not necessarily a good test because it WILL get hot...but that's with stock fans...since you can turn your fans on-did you have fans on whole time when you had thermo out?

yes sir I did.... I am really leaning toward a faulty water pump. which sucks b/c changing it is not fun!!!!!

[9t8z28]

yes sir I did.... I am really leaning toward a faulty water pump. which sucks b/c changing it is not fun!!!!!

I highly doubt that the waterpump is bad... this would be the last thing that I try. Waterpumps are very simple parts. When they fail, they leak.

[side2000]

take your cap off radiator before you fire it up and look down in to see if its pumpin

[moesplace]

Some one mention check for obstruction for air flow had a 96 Z28 same problem you have it was a plastic bag on radiator could not see it because of AC coils found it when I went to pull Radiator

[ls1_02]

O.K., I just ran into the same problem after installing new cylinder heads.

I had a large amount of air trapped in the system and it would not bleed out. I ran the car for about 45 minutes off and on. I would let it cool off and then start it again.

Finally I got the idea to jack up on the left rear side of the car so that the air could escape. As soon as I did this the air bled out and the temp dropped instantly.

Give it a try.

really?? Never would have thought of that I'll give it a try and see what happens! did your heater work when it was getting hot? why the left rear side of the car?

[ls1_02]

I highly doubt that the waterpump is bad... this would be the last thing that I try. Waterpumps are very simple parts. When they fail, they leak.

yea that what I though but I bought a reman from oreillys.. I thought maybe a chance it will fail?

[ls1_02]

take your cap off radiator before you fire it up and look down in to see if its pumpin

I looks to be pumping .

[9t8z28]

really?? Never would have thought of that I'll give it a try and see what happens! did your heater work when it was getting hot? why the left rear side of the car?

No, the heater did not work.

Because of the design of the system, air gets trapped in the highest places so leveling off such things as the upper radiator hose can solve this.

[9t8z28]

yea that what I though but I bought a reman from oreillys.. I thought maybe a chance it will fail?

When they fail they leak.

[ls1_02]

No, the heater did not work.

Because of the design of the system, air gets trapped in the highest places so leveling off such things as the upper radiator hose can solve this.

so jack on the passenger side rear of car? as high as I can?

[ls1_02]

When they fail they leak.

ok hopefully you are right.

[ls1_02]

ok hopefully you are right.

I sure hope jacking it up fixes the problem!!! it's been a real pita!!

[9t8z28]

so jack on the passenger side rear of car? as high as I can?

No, the driverside.

[9t8z28]

I sure hope jacking it up fixes the problem!!! it's been a real pita!!

Throwing a jack under the car takes 10 minutes vs. 2 hours yanking the pump

[ls1_02]

No, the driverside.

ok thanks.

[ls1_02]

Throwing a jack under the car takes 10 minutes vs. 2 hours yanking the pump

yea no doubt

[ls1_02]

I tried jacking up the drivers side rear and the passenger rear... didn't help. I flushed the heater core with both hoses off and with one hose off to back feed the radiator until it over flowed... didn't help still no heater and the car is getting very hot. what else other than a bad waterpump could it be? oreillys told me that 40-50% off the time the reman water pumps come back bad. which leads me to think maybe the it is the waterpump. any more help would be greatly appreciated.

[ls1_02]

could the optispark be installed incorrectly? it doesn't miss and starts up fine. I don't see how the heat wouldn't work but it's just a thought.

[side2000]

will the car overheat when youre drivin? did you check to make sure both fans were workin? dont flush anymore. that's not the problem and you might create the air pocket problem. when you yanked your thermo---did you have fan on from idle til it overheated? this is important.