I have a 91 z28 and it doesnt stay cool. I have a brand new water pump. 160 stat biger radior Eveything upgraded and it still runs hot. What the hell is worng with it

 

how hot is hot, I know 86/87/88s and maybe others ran infamously in the 225 range, that's the temp they were supposed to run at, you also have to look at where you live, it may be warmer or more humid and cause an increase in temperature, I know my problem when i was overheating was the cooling fan not turning on early enough or not at all, so I repalced the fan, unfortunately, I replace the fan about every 2 years now, but the price to pay to stay cool, I also eventually went to a becool radiator and an edelbrock high flow water pump and now I reach 225 on my hottest days and 175/180 on most days.

 

i'd change to a 180 and wire up a switch or follow one of the write-ups at thirdgen.org so that your fans will work better.

 

are all your fans running ok?

 

yeah i forgot to say mine always runs around 220 around the city cand i have underdrive pulleys slowing my water pump it's pretty normal!

 

try the JET fan switch to turn your fans on lower.

have you tried anything like "water wetter" which is supposed to lower the cooling nature of water?

oh and make sure you have your air dam under the car's nose...to make sure enough air is going over the radiator

 

I had the same problem with my 87 Iroc but my car would over heat. sitting at a stop light. So i got sick of it & Had my husband wire the fans in to the battery. Until we can get a switch or something for the car.
Now she dont move much beyon 100 Degrees.

 

Check your AC condenser to see if the fins are bent. That disrupts air flow and could cause a problem with cooling. Also, check that the spaces between the radiator and condenser are not blocked with debris. Flushed coolant lately? Also check for radiator cap pop off pressure.