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Topic: Radiator question

in Forum: C4 Cooling and Heating Systems


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Radiator question (1/8)
 1/30/16 9:12am
Cbarison
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Eastchester, NY - USA

Vette(s):
1987 c4


Joined: 6/25/2014
Posts: 31

Question I cannot find the answer to; under the radiator cap & below the coolant line fitting there's a hole, does it need to be capped? does coolant just spill out when it gets hot? i'm getting the coolant low message but there are no codes when I connect the code scanner. also the coolant temp reads 299 when clearly its not that hot. its an '87 C4. I really appreciate any help on this. Cbarison

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Re: Radiator question (2/8)
 1/30/16 11:50am
Adams' Apple
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Duncanville, TX - USA

Vette(s):
1985 Coupe-L98/Auto,Bright Red/Carmine. 1974 Coupe-L48/4speed, Medium Red Metallic/Black Deluxe.


Joined: 3/18/2009
Posts: 2230

Can you get a pic of this "hole"? If there is coolant blowing it of it when running, then yes, it needs to be plugged. Just not clear on where this hole is...
299f temp is obviously incorrect...could simply be a bad temp sensor, or a short in the sensor wiring.


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Re: Radiator question (3/8)
 1/30/16 12:00pm
Cbarison
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Eastchester, NY - USA

Vette(s):
1987 c4


Joined: 6/25/2014
Posts: 31

Its the hole right under the white letter K-85 or K-86, yes cololant does spill out when running, could it be I'm missing a coolant line that should go somewhere else? is there a sensor missing? the coolant temp sensor on an '87 is under the throttle body. I'll take a pic as soon as I can. Thanks Cbarison

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Re: Radiator question (4/8)
 1/31/16 3:48pm
The Car Whisperer
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Andover, MA - USA

Vette(s):
1986 Coupe


Joined: 3/22/2009
Posts: 50

I think you may be talking about the coolant level sensor, it just snaps in and has one wire going to it.  Rock Auto has them for less than $15.00.


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1986 "Bright Red" COUPE - Aluminum Heads,
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Automatic, Bilsteins - "Mostly Original" otherwise.

Re: Radiator question (5/8)
 2/21/16 8:51am
Cbarison
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Eastchester, NY - USA

Vette(s):
1987 c4


Joined: 6/25/2014
Posts: 31

Yeah, sure enough, it was the radiator sensor missing from that hole! It was pinned underneath the car, so I didn't see it from up top. Its now in and the coolant temp and levels are normal.

Thanks for all the help guys!

The car is running like a beast! The idle is still all over the map, when stopped at a red light it'll go from 6 all the way up th 14. Besides having the car dyno-tuned, is there some sort of idle regulator one could add-on?

Thanks again,
Cbarison 




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Re: Radiator question (6/8)
 2/21/16 9:05am
The Car Whisperer
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Andover, MA - USA

Vette(s):
1986 Coupe


Joined: 3/22/2009
Posts: 50

Sounds like a Vacuum leak.  Can you check around and see if you have a disconnected vacuum hose?  That's the first thing I would l would look for.  Sounds like a large leak.  



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1986 "Bright Red" COUPE - Aluminum Heads,
Sport Seats, Bose, Ultra-Flo Exhaust,

Automatic, Bilsteins - "Mostly Original" otherwise.

Re: Radiator question (7/8)
 2/21/16 10:40am
Cbarison
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Eastchester, NY - USA

Vette(s):
1987 c4


Joined: 6/25/2014
Posts: 31

My local mechanic found a massive vacuum leak and fixed it. Since I changed the headers, I had to leave the O2 sensor unconnected. I'm thinking that may have something to do with it as the engine is running in an open loop mode.

The EGR pip has been covered up for the same reason, I wonder what the right thing to do is with this O2 sensor


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Re: Radiator question (8/8)
 2/21/16 11:46am
The Car Whisperer
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Andover, MA - USA

Vette(s):
1986 Coupe


Joined: 3/22/2009
Posts: 50

My basic understanding is that O2 sensor reads your exhaust output and with the reading from the MAF sensor that is sent to the On-Board computer to adjust the fuel injector pulses to maintain as close to 14:1 ratio of air to fuel.  

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1986 "Bright Red" COUPE - Aluminum Heads,
Sport Seats, Bose, Ultra-Flo Exhaust,

Automatic, Bilsteins - "Mostly Original" otherwise.

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