i have a 91 camaro she is running hot over 220 everything is stock. i was wondering is there a diffrence between a high flow and a high performance thermostat and water pump. this is my first camaro and help would be really appreciated thank you.

 

Not really. Make sure your fans are coming on.

There are a few triggers that turn them on. The fan are tuned on by their relays which are activated by grounding the grn/wht wires to each (ie the have constant 12V to the other side when the car is on). The ECM directly controls the primary cooling fan (or called just the "coolant fan") and the "heavy duty coolant fan" is directly controlled by switches and does not use to turn on. The coolant fan is on the driver's side and the heavy duty fan is on the passenger's side.

1. Turn on the air conditioning. They should turn on and stay on. ("Fan A/C Pressure Switch" and the "ECM" in the diagram. For A/C, the fan pressure switch activates the heavy duty cooling fan relay and sends a signal to the ECM which turns on the primary cooling fan.)
2. Once the car warms up (around 200 - 220), the fans should turn on and the turn off a few minutes later- when idling ("ECM" which uses the coolant temperature sensor to read the temperature. This is not the same sensor that drives the gauge in the instrument cluster. If this sensor is not sending the correct temp, the ECU won't know what the actual engine temp is, and may not turn on the fans.
3. There's another temperature switch that turns on the fans if the temperature goes above 238 deg F. ("Heavy Duty Coolant Fan Switch")

A good quick test is to put the engine in run, but not started. Jumper ground the grn/white wires on each relay one at a time. One relay will turn on one fan (that will be your primary coolant fan and its relay), and one relay will turn on both fans. That is the heavy duty cooling fan relay.

Here's a diagram from the 1989 manual:

 

TBI or TPI car?

 

220 is normal operating temp. If you want it lower it requires a lower temp thermostat and a custom PROM to turn on the fans sooner.

GD

 

you can by thermostats that work at different temp ranges. You may have one to hot for your car/climate.