white88TA

Alright I've been reading for a long time about this cooling issue I am currently having. I've seen a billion posts about it and I figured I'd just toss my issue up and see if anyone can help me. 1990 Camaro RS 305 TBI is what I am rocking now the issue is the car would literally redline on the temp meter until it started smoking which lead to immediate shut down. Fan would not kick on or anything. Mind you this was the issue when I first got the car so I did some reading and decided why not try the A/C on trick and see if that works. Well it did there's nothing in there so why not just run it with the A/C controlling the fan car ran great well today I was doing some basic greasing fixing turn signals and doing tire rotations and noticed that it was heating up again with the A/C on now the fan will not kick on anymore with even the A/C turned on and I'm back to the heat up issue. Any help will be greatly appreciated. I'd like to do this the proper way and not use a fan switch inside the car I see people doing it all the time but i'd rather just have it click on when it needs it and stay off when it doesn't need to be on.

NINÅ

white88TA

I'll check later on today if i'm reading correctly you want me to Ground Pin B ? To see if that'll turn the fan on ?

NINÅ

monte0185

Sounds like the relays have gone out. Try grounding the green/white wire with a test light for the main fan and the grey wire for the aux fan. Relay should click and fan come on. Helped me in troubleshooting mine from being hard wired.

white88TA

I meant to post back a long time ago. But my daughter arrived 4 weeks early and then came Reconstructive ankle surgery which post-poned the camaro for the winter so I just covered it and parked it. But grounding B did not turn the fan on I tried it right before I went in for surgery and I was putting it on stands. One thing I Do recall is when I started it a week ago the fan was kicking on again. Seems like most of the time it wants to turn on when the AC is on but sometimes it does not. Could it be the fan switch everyone is talking about between 6 and 8 on the head ?

deadbird

IIRC, on a TBI car, the HVAC control directly grounds the fan relay for A/C operation (or the fan switch, high pressure A/C line switch tied to relay ground also) and there is no ECM control of the fan .

Jumpering the A-B terminals won't do anything for the fan (to run) as it's not ECM switched.

Ozz1967

iTrader: (4)

Will this also work for a 1984 model? Just stick a wire in it and run it to ground somewhere? Car running? Just ignition in "on" position?

NINÅ

white88TA

Just an update everyone, Because of time and jobs and stuff I've just been driving the camaro with the AC switched on to where the fan is running all the time. Well last week my distributor went out and I completely lost power to my Injectors. Thank god it happened near my mechanic. He's a good friend so he is the one that found the problem really quick because he used to have an older F body. Well I did a full blown tune up MSD Everything and Bosch spark plugs and my buddy also deleted all that smog stuff under the hood. It's a 305 TBI know it's not fast but I enjoy driving it daily so i'm not trying to make it a beast but want some pep. Besides the point i told them about the fan he said it was a relay of some type I didn't get into detail on the block. Also they added a new thermostat as well new hoses and elbow's. Car runs like a dream now fan kicks on at 220 and i'm happy. Now does anyone else have an issue when the fan kicks on it literally sucks so much power it almost feels like the car is about to stall out because of the power draw ? Sorry about the book but I keep it detailed. Thanks

Ozz1967

iTrader: (4)

Glad you got it sorted!

Yes, the fans do draw alot of amps. On my single electric fan carbed car, it drops my volt meter rating from 14 solid to just about 13 and I can feel the drag on the motor at idle.

white88TA

Yeah I was like Ow man is my alternator going now ? But i'm just glad it's running normal I normally do all the work myself but electrical ? yeah have fun mechanic buddy lol. But this is my spring summer work car so it has all the bark and TBI bite (none). If i wanna get nuts i start the trans am ..

86T/A_Ram_Air

the fans suck a lot when they kick on. I have the same on my dual fan car, when the low speed kicks on I lose about 1 volt

white88TA

Yeah it's a nice jump at least a volt. And because this car is my daily driver F body and have no intentions of re-doing anything as of this year on it. I was going to add a 10 inch woofer in the back because of my commute to work everyday and our cars come with such great audio. Now i'm half tempted not too lmao then i'll be slapping a new alternator on for sure.

86T/A_Ram_Air

I ran a 8 inch amp/sub package. the amp and the sub were one unit. I think sound ordinance makes it. It was small so it didn't take up a lot of space and it sounded great and didn't suck a lot of power when it hit. This might be a good option for you

EDIT: This is the one I am talking about: http://www.crutchfield.com/p_777B8PT...PT.html?tp=114

white88TA

I actually have one of those in my 95 trans am but its one of the mtx thunderforms I believe doesn't sound bad at all. I actuslly found a 120amp power master brand new from summit that I bought for my old third gen trans am that I am going to throw in and just power up a 10inch. Our cars really lack audio power and iI love my rock loud lol

NINÅ

86T/A_Ram_Air

you and me both

white88TA

Just a question because I am not going to open another thread about this. But my old third gen had a Be Cool radiator in it so it seemed that thing never ever over heated. But One thing I am noticing since the fan is working. As i'm driving the car will literally heat up to the mid mark then creep past that ( fan kicks on) but it seems like it doesn't start to cool down until it's near the red almost. Do these single fan cars tend to heat up to the point there about to boil over and then just kick the temp down within 10-30 seconds ? Or am I possibly looking at maybe a radiator issue or a thermostat issue ? Or is this just something to expect out of GM's let's run these 305's hot plan ?

86T/A_Ram_Air

no it should not heat up that much. It should get to about the 230 mark roughly and then start to cool off. I would check to see ig you have any debris up there. How old is the rad?

white88TA

I mean it really depends on the day as far as it heating up. But it'll Go past the 220 mark then all the sudden start to rapidly cool it seems. I've done a lot of reading here on the forums and I have seen a lot of posts stating that the gauges are far from accurate. But I'll let it sit there for 20 mins in my driveway and let it run and it'll do the same thing. Heat up heat up heat up. Then cool and not go past 220. I guess replacing the radiator could be an option. Seeings I have no time right now to do it myself due to a hefty work schedule. I'll just go drop it off at my mechanic/friend and just have him putt with it. Plus I need to redo some suspension parts anyway and get it lowered a couple inches and put in my posi rear end I picked up for nothing (lucky).