Hi,

My Z28 1984 pass the winter in my garage. Now the nicer days are comming but i'm overheating in town or roads.
Means before i was near 105°C (middle of gauge) , then now i'm going udner the red zone, so i put heater in car at highest level to have it go down and being able to go back house. I

• flushed the radiator : The liquid was clean green/yellow, no oil inside, not dirty.
• I cleaned inside with the product adapted, run in temerature, then fulshed a second time , then new coolant liquid.

=> Same trouble, need to put heater in car to have the t° lowering down.

1°) My car was equiped with AC , but there in no compressor for years, and i don't plan to reinstall. Can i remove the little radiator in front of the big one to have more airflow ? (see picture of radiator and my fingers , can i remove screws here ? (no compressed fluid inside? no troule after ?)

2°) the plastic part is present under car like i read in some threads

3°) is the only option have to add two blowers in front of radiator ?

Best Regards

Laurent

fan behind radiator

can i cut here those two parts that goes to little radiator

plastic part for air flow

the little radiator in front of big one

big one is not new of course

 

Borrow an infrared heat gun and check that the engine is actually overheating; your temp gauge may be inaccurate. Past that, if the car was OK when you parked it, the thermostat maybe stuck shut. Remove it, tie a wire around it, and dunk it into a pot of simmering water to see if it opens.

Yes, you can remove all the AC components---if the system has already been professionally evacuated of refrigerant. You'd do well to remove all parts, lines, etc., intact and save everything in case you decide to replace it at a later date.

 

- the "little radiator" looks like a factory installed oil cooler-is your car a z28-E ?
- the lower fan shroud is missing-this would be installed on all A/C equipped cars-certain non-A/C cars did not have full fan shroud
- A/C condenser is still in place and you will improve high speed airflow a little by removing that
-stuck thermostat is most likely the cause of the overheating

 

If the car ran at the correct temp before the winter, hacking parts off of it now isn't going to REPAIR it. Might "fix" it, by some sort of accident, but … the operative concept remains, "hack".

Check the actual coolant temp with an infrared thermometer. You can pick up a sooooper cheeeeeeeeep but entirely adequate one at Harbor Freight. Probably plenty of other places as well. The temp might be fine, and all you need is a sending unit for the gauge.

Come back and let us know, and we'll guide you in the right direction that DOESN'T involve hacking on your car.

I would NOT recommend, under ANY circumstances and/or for ANY reason, hacking the AC off of the car. There are few better faster ways that I know of to turn a really nice cruiser into a filthy interior, BO bomb, trailer-trash POS than that.

 

Thanks for your mails.
I'm now not as hot as before my coolant liquid change. It's better. I'm just over the middle, it was little under middle before.

- I will try to find the bottom lower fan shroud on rockauto that will help
- what about the fans that push air in front of radiator ? any kit easy to install that doens't hack the car ?


Laurent

 

Find what broke and repair it. Something has changed: your best plan of attack now is to UN-change it. Put it back the way it was.

Don't pile more stuff onto the car that it didn't need before, while leaving something else broken. That's not smart.

Yes you should replace the lower fan shroud. Especially, if that was there before, but this started after it went away, that could very easily be the actual problem.

A trip to the high-pressure spray car wash might help. Everything works better when it's clean.

 

Check for mouse nest stuff between the radiator and whatever that thing is in front of your radiator. Had the same issue for ages on my '88, and found it stuffed with leaves, rags, and cigarette butts where a mouse had built a nest there. It wasn't even visible until I pulled the radiator away.

 

Hi,

I installed the bottom lower fan shroud , it's nice but changed nothing.
One guy said me that there is a "coupling" system that should be with oil inside , and when motor turns faster , the "coupling" system make the blade turning faster.
And yes my "blade" turns very slow, and doesn't turn faster if i do accelerations.

What is the name of this part number on rockauto for a 1984 z28 ? i don't find the right clutch fan . Is it a thermal or non termal model to order for a V8 5L ? why the clutch is related to number of blades ?

Can i also add some electrical fan after to amplify airflow ?

Best Regards

 

Does seem like you might have a bad fan clutch if fan turns very slow and does not speed up a little when you rev the engine.If Rock auto does not list fan clutch for 1984 z28,try 1982-same fan clutch as an '84(certain 1984 z28s used an electric fan) Added auxillary electric fans probably would not have any effect on cooling if the engine fan is in proper working order,but if you want to add some just for kicks ,I know Renault 21~1988(US version-Medallion) has a really nice powerful double pusher fan setup that is pretty thin and might fit

 

Right: the name of that part is "fan clutch". It should allow the fan to decouple when the air coming through the rad is not hot, but as soon as it reaches some appropriate temp, it should hook up, and drive the fan hard. When you first start the car up cold it should be hooked up just from the fluid all settling, but within a few seconds, should uncouple. If it doesn't do that - roar for a bit until the first time you accelerate then quiet down - it has probably leaked out all its fluid, and failed.

Get THE RIGHT KIND to replace it. It will be called "thermal" or "'thermostatic'. They may offer.you a cheeeeeper option called something else; DO NOT downgrade to whatever it is. The system will not work right unless you put in the right part.