Well my 1991 V8 Camaro is still overheating after some work with the fans. The fans work properly both are coming on when they should. The problem is that when I'm on the freeway the car overheates up to 240 degrees and if I let it it would go all the way to 260. When I'm on the streets the car cools down to 210. I don't know what to do, the fans are working like they should. So I'm thinking of putting a new radiator a bigger one than the one that I have right now(less than a year old)I got it from Auto Zone. Any suggestions. Thanks.

Are your fans turnig the right way a pusher and puller? Also maybe your radiator hoses are collapsing

[This message has been edited by white 78 (edited 05-12-2001).]

Is it full of water?Is the radiator internally restricted? Like "78" said,check to see if the fans are blowing towards the rear of the car.They can be wired wrong,and blow towards the front.

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68 z28 ,68 rs 327 ,73 454 vette, 2 goofy kids

Do you still have the air dam under the car???The plastic thing that scrubs on every bump http://www.camaros.net/forum/wink.gif

If it cools down at idle its not the fans it has an airflow through the radiator or a partially pluged radiator problem.

was there a problem before the work on fans?,if not i would really check that out 260 degrees is way to hot never let it get that hot,if you had problem before fan work check to make sure the radiator is flowing ok,autozone is prob. not the best place to get a good reliable radiator,also i had a 70 nova that started overheating i found the impeller on waterpump was slipping at times causing it not to flow when i installed new pump it was worse than before come to find out my pepboys waterpump was defective impeller was made with fins going in wrong direction,just take it 1 step at a time and you will get it there should be no need for larger than stck radiator(it was fine when new)good luck!!!!

have the radiator professionaly cleaned,should be around $50.its worth it and should cure your problem.

Thanks for all the replies, yes I still have the air dam, under the radiator. I just clean the radiator today but still overheating. The fans do work properly they take the air to the rear of the car. I don't know what else to do, the car has given me alot of problems lately. Anymore ideas?

With the temps.you have been running,could be an engine condition.Does it boil over?If the engine was the problem I would think you would have a problem at idle too.Long shot here...is the timing set properly,is it getting the proper advance?What about the exhaust,could it be plugged/restricted?I notice you also have an emissions problem.

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68 z28 ,68 rs 327 ,73 454 vette, 2 goofy kids

what kind of condition is the exghaust in?may converter is plugged? change the water pump?i bought one of those high flow pumps and the damn engine would run hotter the faster i ran it(new motor).so i took an old one kicking around and i'll be damn the engine ran cool ALL the time after the swap!!!! if the water is moving too fast it doesn't have time to remove the heat from the engine.

sldhd did you have a thermostat in the motor that should be enough restriction to keep it from overflowing the coolant.

i sure did, i would never run a motor without one. the make of the pump was FLOW COOLER. the thermoustat was an acurate 180 degree one.the only thing i could think of was that it was causing some sort of cavatation in the block at higher rpms.still have the same thermoustat in the motor. i also had put in a BRAN NEW 4-core radiator,so i know it wasn't that either.

I had the same problem when I put a four core in my camaro i have a 1992. The problem was the lower radiator hose . See at high rpm the hose was calapsing so I went to autozone and got one with a metalspring inside of the hose it wasnt for a camaro it was really close to the same shape so take your old one with you and make sure their is a metal spring inside of the hose.

never thought about that,i love these boards!!!!!!!

Guys the hoses are all right. The engine is doing a noise so it could be the water pump. About the thermo I have a 160 degress would a 180 be better?

A stock 91 camaro needs a 195* thermostat to run properly.I remember you have a emissions problem,high CO,160 stat will make the CO's high,the car is still in "choke" mode.A cooler t-stat will just slow down the overheating by maybe 5 minutes.

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68 z28 ,68 rs 327 ,73 454 vette, 2 goofy kids

maybe the sensor is bad? is it boiling over or the gauge says it over heating?

It's boiling over the sensor is o.k. they tested in the shop a few days back, I'm going to change the thermo to 180 degress and take it to admission tomorrow. The a/c compressor is still running all the time even is the a/c is not on inside. What I want to do is connect the a/c fan directly so I can turn it on/off from inside the car and disconnect the a/c from the motor until I get money to fix it. Can anyone help me, some tips to connect the a/c fan directly so I can turn it on manualy? The car turns off sometimes when I hit the brakes, like the gas is not passing thru correctly, but when I disconnect the a/c from the engine, the car runs faster and doesn't turn off. Do I have to change the gas filter or could the a/c be doing all this problems? Thanks guys

Here's one other thing to consider ? I've done alot of paint and body repair and have found that many times alot of p/b shops will not install correctly or replace properly the air diverters under the front facia !
the diverters must be aligned and installed correctly to allow proper air flow to the radiator, just a thought


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R.Chambers
69 rs327 a/t & SS396 m/t

You may also want to check the heater control valve.

Usually, overheating at idle and low speeds is due to a lack of air flow through the radiator. I suggest replacing the fan blade with one with more blades. I also suggest adding a shroud around the blades to allow the fan to pull air through the entire rediator. Though a larger radiator will delay the inevitable, the lack of air through the radiator will still take its toll. Ray

I just happened by and had to read this cooling thread and make a comment.

Have you made any modification to the car...like a performance chip (I am assuming that it is still an injected car) or the like. Any performance mods at all?

9 times out of 10 when a car is cruising down the highway and running hot the culprit is a too lean of a mixture. This can be caused by a misloaded performance chip, a vacuum leak behind the air flow system or the like. I have seen this very same thing on a 92 Firebird and it was a vacuum leak at high cruising speed making the mix too lean resulting in temps over 250.

Some of the other guys here did hit on a water flowing system that might be faulty, but if they cruise at slow speeds .......then usually they are okay even though stranger things have happened.

Good luck with your problem....

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STEVE JACK
SOUTHEASTERN GOODGUYS REP

ps......was the radiator from Autozone a stocker or what?

[This message has been edited by HOTRODSRJ (edited 05-20-2001).]