Running a little warm, airflow problem??????
Thread Starter
Instructor
Joined: Mar 2002
Posts: 247
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From: las vegas nv
Running a little warm, airflow problem??????
Hi guys. ok, just got through putting twin Spals on my car. have griffin aluminum radiator. Around town , works great, even have cold a/c at an idle at a stop lite. Very nice here in Vegas. On the highway though, its running a little hot. About halfway between the 200 mark and the next mark, probly about 210 to 215. With the old fan and shroud, would only get to the high side of 200 mark. have good foam seals everywhere but the top of the core support. Could that area being open bypass enough air to be the problem?? have a good lower air dam, new last year. good water pump, bout a year old. just did a rad flush last month to clean everything up inside. Was only 95 here yesterday, and i dont think it should be running this hot, and i don't want it running 20 degrees hotter when it gets 20 degrees hotter. Going to get warm here in the next couple months. Any help here greatly appreciated.
oh, when i get off the highway, she cools down to under 200 in a couple of stop lites. even cools sitting at idle with a/c on max cool. Fans are great, would just like it cooler at highway speeds. Thanks, FNG
oh, when i get off the highway, she cools down to under 200 in a couple of stop lites. even cools sitting at idle with a/c on max cool. Fans are great, would just like it cooler at highway speeds. Thanks, FNG
Race Director
Joined: Feb 1999
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From: Lenoir City Tennessee
Ci 6, 8 & 10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15
Re: Running a little warm, airflow problem?????? (FNG)
This was happening to me with my OLD radiator. It sound like a coolant flow problem. Is the radiator full?
Thread Starter
Instructor
Joined: Mar 2002
Posts: 247
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From: las vegas nv
Re: Running a little warm, airflow problem?????? (Eddie 70)
yep radiator is full. flows like a champ. was ok a couple weeks ago before i took off the shroud and clutch fan. thanks though. fng
Le Mans Master
Joined: Aug 2000
Posts: 6,273
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From: Austin TX
Re: Running a little warm, airflow problem?????? (FNG)
Check that fans are properly wired (spinning the right direction), check lower hose for possible collapsing, cruise with headights up to see if more air helps, remove front license plate, install hood seal on top of rad frame, install lower temp thermostat, check temp setting and installation of fan sensor.
Thread Starter
Instructor
Joined: Mar 2002
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From: las vegas nv
Re: Running a little warm, airflow problem?????? (flynhi)
fans are wired ok, pulls. temps sensors are ok, fans cycle properly. yes, opening headlites does cool it down some. going down to home depot in a few. will get some foam and seal the hood to core support. those are currently in pretty sad shape. do you think thats enough of an air flow loss to cause it?? i live in the desert and keep my cooling system in xlnt shape. like i say, with the shroud and original fan, didnt have this problem. i was looking in there this morning and where the old shroud raises to cover the fan blade, it was pretty close to the hood. maybe that blocked enough air to do the trick. will try sealing the hood and run her up on the freeway and see what gives. thanks for the input. fng
Melting Slicks
Joined: Nov 2000
Posts: 2,112
Likes: 3
From: Kingston, TN
St. Jude Donor '06
Re: Running a little warm, airflow problem?????? (FNG)
Did you change anything else? Too much iginition advance will cause this. Usually overheat at highway speed is not airflow but coolant flow. In town is the opposite, airflow.
Le Mans Master
Joined: Aug 2000
Posts: 6,273
Likes: 14
From: Austin TX
Re: Running a little warm, airflow problem?????? (FNG)
I tried Water Wetter a few years back and had some success. I also installed the FlowKooler backing plate on the water pump impeller and noticed a sig diff. Check rating and conditon of rad cap(s). You want a low rating (7) on the rad and a higher rating on the exp tank (15). If these are not correct, you will continually blow coolant out the relief tube and stay low on coolant. Insure that heater hoses are properly plumbed to exp tank. Install a high flow thermostat. Be sure to check lower hose for softness. If it is collapsing, your coolant flow will be down. Try flushing the rad. The rodding may have loosened enough crud to partially block some passages. In LV, you can run a different water/coolant ratio. A 90% distilled water, 10% antifreeze will cool better and still offer corrosion protection. You MUST use distilled water if you do this.
Well, I'm out of ideas. Let us know your results.
[Modified by flynhi, 9:09 AM 5/17/2003]
Well, I'm out of ideas. Let us know your results.
[Modified by flynhi, 9:09 AM 5/17/2003]
Melting Slicks
Joined: Feb 2002
Posts: 2,298
Likes: 1
From: Sodertalje/Sweden
Re: Running a little warm, airflow problem?????? (flynhi)
If its a BB normal workin temp is about 210 :eek: .I`m running with a BeCool Alu rad,CSI waterpump and dual 18" fans,but only one run normally.I`ve read on the forum that the temp sender is somewhat "crude" in its measurements.. :cheers: :cheers:
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Thread Starter
Instructor
Joined: Mar 2002
Posts: 247
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From: las vegas nv
Re: Running a little warm, airflow problem?????? (Fevre)
Thanks fellas. sometime today ill seal the top of the core support to the hood. didnt think of the radiator cap!!!!thanks. ill put a new one on and give her a spin. thanks for the input guys. regards, fng
Le Mans Master
Joined: Aug 2000
Posts: 6,273
Likes: 14
From: Austin TX
Re: Running a little warm, airflow problem?????? (FNG)
The Spal fan housing has numerous rectangular flaps that should open at speed to allow more air to flow thru. Check to see that these are not stuck closed. I oriented my Spal so that the flaps connected at the top so that gravity would close them.
Melting Slicks
Joined: Jul 2002
Posts: 3,128
Likes: 3
From: Deltona (son of Deland and DAYTONA) FL
Re: Running a little warm, airflow problem?????? (FNG)
First I got a new rad cap. That lowered my temp on the hwy 10 degrees. Then I went with a high flow water pump and am running water with Zerex water pump lube/corrosion inhibitor (Stewarts says tap water with the additive is OK too). That lowered my hwy temps 30 degrees. Then the other day around town ( getting very hot here too in SW FL) I got over 200 for the first time in a while. I spun the fan clutch and felt little resistance. I installed that today, so I haven't tested it yet.
Thread Starter
Instructor
Joined: Mar 2002
Posts: 247
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From: las vegas nv
Re: Running a little warm, airflow problem?????? (isosceles)
very cool. what stage stewert pump are you using?? been looking at those for a while along with the thermostats they have for sale. may just order one and get it coming. gonna be hot here in another month and my vette is my daily driver. thanks for the input. i sealed the to of the rad. going to go get a new cap now. thans again. regards, fng
Melting Slicks
Joined: Jul 2002
Posts: 3,128
Likes: 3
From: Deltona (son of Deland and DAYTONA) FL
Re: Running a little warm, airflow problem?????? (FNG)
.
very cool. what stage stewert pump are you using?? been looking at those for a while along with the thermostats they have for sale. ...
I don't have a lot of power...yet, so every ounce counts!
Stewart has very good Q&A tech support on their forum too
