factory89tpi

Hey guys maybe somebody can help me I have a 305 tpi with the stock dual fan set up my ac has been yanked out cause the compressor locked up. I am needing to figure out but I know they say these cars should normally run at 220 to 230 temp before the fan kicks on. I really don't like that. I have let it sit and idle and it runs good but it will start to sizzle out the radiator like I could here sizzleing on of the radiator cap. But I am not loosing coolant. I have no egr and I am trying to get this car fixed up I did fix the air damn cause it was bent back more cause all the bolts were not in there so please somebody help me I will put a picture of the car on here so you can see it. oh and I have replace the fan motor on the drivers side and it does kick on normally. but only goes to about 200 then shuts off

John in RI

iTrader: (167)

You might not like it getting to 220-230 before the fan kicks on, then the fan kicking off @ 200,... but that is the way GM designed the cooling system to work. If you want it to run cooler than you will need to 'custom' modify it.

Even when Overheated coolant begins to boil into the overflow bottle,... there should be no "hissing" or "steam" apparent around the radiator or the cap. ( Stay clear of the overflow when if it does overheat ! ) So; If you hear "hissing" or have "steam" coming from the radiator or cap and the coolant ISN'T boiling into the overflow bottle, you probably have a pin-hole leak or a bad seal on the cap & will need to replace the defective part(s). IIRC: the factory cap pressure rating is 15 pounds. )

factory89tpi

Hey John thanks for posting I know the radiator cap that is on it is a cst pressure relief cap I have been told they are junk and to go back with the 14 dollar ac delco cap

John in RI

iTrader: (167)

No problem !


I prefer the stock cap myself, but I've had to toss many of them in the trash myself because the seal was NG. Once your sure the cap's seal is good and properly rated, keep a close eye out for that hissing. Once the system is sealed tight (for sure) the increased pressure might enhance any pin-holes in the radiator itself causing them to become easier to detect.

Most cars will activate the "Heavy Duty" cooling fan when the Heater/AC controller is turned to any AC setting. So,........ try turning on your AC and look to see if the "secondary" fan comes on. If the secondary fan turns ON/OFF with AC selected on the controller you can manually turn on the secondary fan any time you desire.

factory89tpi

I have no ac in the car is there a way to put it on a switch so it will run when i need it

John in RI

iTrader: (167)

So; your Heater and AC controller doesn't have an AC setting ??

factory89tpi

my car does have the controls for it but there not compressor or evaporator all that is left of it in my car is the condenser

ploegi

All the electrical still there? When you put the controls in any position that would normally engage the compressor, it should also turn on the cooling fans.

factory89tpi

the relay for the passsenger side fan



Had to do some temporary wiring repairs



there is the wire going down to my auxillary fan I do know it work cause if I hook a wire to it and touch it to the battery it does come on



This is on the side of the air box



these 3 wires I believe go to the compressor that is no longer there

And I do know that when I turn it to ac the blower motor kicks on no problem but the fan does not