Third Generation F-Body Message Boards - Cooling

ac problem help please

usacamaro — Fri, 20 Nov 2009 01:34:09 GMT

the problem is my ac only blows out the windshield defroster not out of the vents. cant figure out what is wrong any help with this problem would be great help. thanks in advance.

cooling trouble

FloridaZeke — Thu, 19 Nov 2009 20:44:22 GMT

Got an 89 firebird formula a couple weeks ago...305 tbi with a six year old jasper in it...I thought it seemed to run a little hot so I put a new thermostat in it..elect fan is coming on and off intermittently looks like around 220 and off about 190 or so based on the 20 year old gauge and brings the temp down some but the first time I took it out on open road where I could open the engine up some the temp needle started to climb considerably...when i stopped (eng still running) the fan cranks and the temp comes back down????

I can see there is good circulation from the water pump...

cap looks new and pull the lever you can hear press release...

strange...this car deserves to be opened up on the freeway....

any help would be appreciated...

i poured oil in my radiator

matthufham — Thu, 19 Nov 2009 06:30:13 GMT

ok here's the situation.. i say i'm going to install a new temp sensor, and top off the old radiator. picked up the bottle of antifreeze and poured, then noticed it was old motor oil in the bottle not antifreeze after pouring a few cups worth. i put the hose in the radiator and flushed out some of the floating oil, but there's still some in there. that was actually 2 days ago and it hasn't had a cooling issue, but is this going to be a problem if i don't flush it?

That little switch on the back of a R4 compressor

85 ZXX — Wed, 18 Nov 2009 08:31:18 GMT

On my 85 TPI Z28 I have a 2 wire plug (dk green/white and Lt blue/black wires) that is suppose to connect to a switch on the back of the ac/compressor. I'm just not sure which switch I'm suppose to have...There are three options: 1- High pressure, 2-Fan, 3-Low pressure...Can anyone advise on this? Thanks!!!

coolant switch

missybar — Tue, 17 Nov 2009 05:32:48 GMT

i just installed a new rad with electric cooling fans in my 84 camaro z28( v8 305). is there any other place i can put the coolant switch other that on the pass. side between the last 2 cylinders? the spot where its supposed to go has a plug in it with is siezed in place.

thanks

What size tranny cooler?

chas0218 — Tue, 17 Nov 2009 04:45:49 GMT

I'm trying to find a tranny cooler that will cool the ATF enough to keep my tranny from hurting itself. I found these 2 that I like but need some opinions on size and thicknesses.

http://www.summitracing.com/parts/BMM-70273/
http://www.summitracing.com/parts/HDA-678/

I know to stay away from the tube and fin because they aren't as efficient but have no idea where to go from there.

Thanks, Chas

Cooling problems!!!!

Anderson09 — Mon, 16 Nov 2009 23:32:39 GMT

I have a 1988 trans am 305 TPI. The fans Stopped working properly and it overheated and split the radiator. Will it cause computer errors if i put a manual override on the fans. Also whaqt is a recommended pressure of the radiator cap?

anti freeze capacity

wannaz — Mon, 16 Nov 2009 01:03:45 GMT

just replaced engine in car. car has a griffin radiator in it. how much anti freeze will this system hold. will this be same as stock radiator.if so how much does a stock system hold.

mechanical fan size?

nate perron — Sun, 15 Nov 2009 05:40:09 GMT

I going to put a pulley driven fan on my camaro. what size can I put on there w/out hitting the hood or etc etc ie 17" 18". Also what size spacer would y'alls recommend:thanks:in advance for your input input no.5 love input:lmao:

Erractic cooling fans-1991 - Z28-305 VinF

kybasspoint — Sun, 15 Nov 2009 03:07:50 GMT

I own a 1991 Camaro Z28 with 305 Vin F engine with AC. Cooling fans show erratic operation. The primary fan comes/stays on with AC, but will not turn on, with AC off, at coolant specified temp of 222degrees F . The secondary-heavy duty fan will not turn on with AC but turns on at the coolant specified temp of 238 degrees. The 1991 OEM shop manual indicates BOTH should turn on with AC on high , and with AC off both should be on starting at each specific coolant temp.

I have flushed coolant system, changed thermostat, temperature sensor and checked all fan switches. Could this be dual fan relay problem? My concern is that car slowly almost reaches overheat guage red line at idle in traffic �probably since all fans are not operating when they should? . Any more ideas or is this normal operation?

Thanks

1986 IROC 305 TPI FAN QUESTION

j79z28 — Sat, 14 Nov 2009 22:24:36 GMT

The single fan on my 86 TPI IROC refuses to come on. The car is all stock. The fuse is good. I have tested the fan motor, and it works when connected directly to a battery. I have replaced the CTS on the intake manifold, as well as the fan relay next to the radiator on the passenger side. The fan will also not come on as well when the AC is turned on. After reading some threads, it is my understanding that for 1986, the ECM turns the single fan on when the CTS sends a signal that the fluid temperature is 238 dregrees. Power is then sent from the ecm to the relay, then to the fan. Any ideas out there on why my fan is not coming on at all?

Cooling Fans Not Working

Austin 317 — Fri, 13 Nov 2009 03:54:38 GMT

Hey what's up everyone,
Ok sorry for the newbie question, but my fans have stopped working all of a sudden. The previous owner switch them into the ignition so that they run all the time instead of when the temp sensor wants them to. But now they just don't work at all. I tried the A/c testing trick and they still don't work. The wiring seems to be ok, no shorts, and I think i found the fuse but I'm not too sure.
Can someone please help me find out whether the fuse is blown, and I checked the wrong fuse, and whether or not the ignition switch wiring is a problem. Both fans aren't working so I think that rules out a blown fan motor.
Oh and they were wired together.

The car is a 1991 Trans am GTA
5.7l TPI

Thanks

gurgling in overflow, possible that this the source of air?

street_carnage — Wed, 11 Nov 2009 01:17:40 GMT

after running the car and it not overheating at all, the overflow sometime bubbles. i know its not a head/gasket as i have no other symptoms of this. now, i was going to do the basic things first, burp the system, install new thermo, rad cap etc. but i do have a leaking heater core. well, its not leaking in the pass. area yet, but i do smell coolant when i slide the heater on. so if the heater core WAS leaking, is that a big enough source of air to cause the overflow tank to bubble?

E-Fan Problem

SMURFN' Z28 — Tue, 10 Nov 2009 15:55:03 GMT

Okay, so I have an '85 Z with one E-Fan. The fan will not turn on and just need a little info track down the culprit.

The fan relay is up front near the battery correct? I have 12v on the orange wire, and the fan turns on when I jump the orange and the black one that goes to the fan. The brown wire with the white stripe has some voltage on it when the key is on. Is the green wire with the white stripe for the AC? I get no voltage on that one.

How is this setup supposed to work? I figure either the brown or the green one give a cirtain voltage at tempurature X, and that connects the orange a black wires through the relay, turning on the fan. What kinds of voltages should I be seeing on the brown wire?

Thanks!

Fans work when green/white wire grounded

jo88gta — Mon, 09 Nov 2009 19:45:28 GMT

In a nut shell: Fans are not working.

If I test at the ALDL diagnostic terminal fans do not run. If I ground the Green/White wire at the ECM, primary fan starts and runs fine. So what do I do with that information, it appears that the ECM is not telling the fan to turn on. I have double checked that the ARAP "If Cool T < 14c, (58.5f) then divert" is enabled.

Outside of that, I have checked fuse and fuse links, all looks good. Any advice is very much appreciated.