Hey everyone, I recently bought an '85, and all was well for about a week of driving. That's when issues started surfacing.

First issue is a code 32 service light. The light doesn't turn on until after about 10 minutes of driving
Second is my cooling fans don't seem to be kicking even at the coolant temp of 235+ degrees, or with the A/C turned on. The oil temp would also get up to 260
Thirdly my A/C stopped blowing cold and makes this weird rumbling/squeaking noise when I turn it on. The noise doesn't seem to be coming from the belt
And lastly I'm getting a code 34 light, I don't know exactly when this started as it only started showing up after about 4 days of sitting in my garage while I've been trying to figure out what's going on.

I'm not too mechanically savvy but I'm also not trying to break the bank at the shop so some pointers would be greatly appreciated. Thanks in advance

 

Here is an old thread with a listing of the trouble codes for your '85.

​​​​​​https://www.corvetteforum.com/forums...s-84-96-a.html

 

Thank you
So an EGR system failure and MAF sensor low, I read somewhere these could just be dirty. Is it possible that's what could be tripping the service engine light?
I have access to a public shop where I could take a look at them but I'm not too sure how to diagnose something beyond that.
The cars got 67k miles btw.

 

https://www.corvetteforum.com/forums...-to-clean.html

 

Welcome to the Corvette Forum budyboy363600!

When you are Really lucky the MAF sensor "can" be cleaned with the right cleaner when used properly. The MAF system is controlled by a Power Relay and a Burn-Off Relay which should both be checked or replaced when you replace the MAF sensor. Any one of them can make problems in the MAF circuit. The Burn Off relay is supposed to keep the sensor wire cleaner. Make sure there is no air leaking around the throttle body tubing connecting to the MAF (If you even have a MAF). That tube needs to be secure to avoid any leaks

If you plan on keeping a Corvette like this then you need a set of the Factory Service Manuals for your 1985 as they are priceless when working on the details of the Corvette. They are available from Helm or even RockAuto from what I hear. I like the hard copies but have digital versions as backup. By 1988 the C4 manuals were a set of two books. One focused on the mechanical parts and the other covered the electrical system. Having a OBD1 scanner or equivalent is really helpful when trying to solve a problem. They are affordable and very handy.

The EGR is potentially a more time inclusive item to replace on a 1988 L98 engine. I had mine fail and it was pretty tight work to get in and clean out the passages that are part of the EGR. The EGR is controlled by a Vacuum relay mounted on the Thermostat housing bolt in the 1988 C4. On my Corvette I suspect the EGR Vacuum Relay failed or lost power and it caused the total mess of the system. If you have a vacuum pump and apply it to the EGR valve and then pump it up you should see the EGR shaft move a tiny bit. If it moves you might be lucky here too.
When I did my EGR I ended up replacing the fuel pump, FPR, All eight injectors, the CSI, a bunch of gaskets, EGR itself and the EGR Vacuum Solenoid and numerous parts I forget to mention.

Check the relays that control the Fans and then follow the power if you have to. They turn ON at a high temp in standard mode anyway.

 

Wow thanks this is a lot of good info, I will definitely look into all of this.

Look forward to learning more about all of this