In the summer time 80-90 degree what to hot when in traffic and idling. When should the fan in front of the radiator kick on. Thanks c4conv89

 

Aprox 238*

 

So 238 deg front fan will turn on? and what is temp is too high in the summer heat that should alarm me also when 65-75 deg out it runs cool stays at 200 deg so not sure if i even have an issue Thank again C4CONV89

 

my black 88 runs between 2 and 215 when its 80 and sunny

 

This how it works for an '89. The main fan is controlled by the ECM it comes on when the coolant temp sensor hits ~228*F and off @ ~210*F. The Coolant Temp Sensor can be found below the thermostat housing.

If you have an auxiliary pusher fan in front of the AC condenser it is controlled by coolant temp switch found between cylinders 1 & 3 in the drivers side cylinder head. It comes on @ ~238*F and off @220*F. The auxiliary fan really helps cool down the condenser in hot summer months when the A/C is running full blast. The aux fan temp switch between cylinders 1 and 3 shorts to ground at 238 F, you can buy a temp. switch that turns this fan on at a lower temp (215*F) helping to keep coolant temps much lower than the factory 238*F parameter. When this switch is grounded the aux fan relay coil is energized which turns the aux fan on. As indicated above the ECM will turn the main fan on at 228 F and off at about 210 F. The main fan is turned on by the ECM based on inputs from the coolant temp sensor, vehicle speed sensor, and the A/C coolant fan switch. This ECM controlled main fan can also be programmed to turn on at a lower coolant temperature with either a tune or a eprom (chip) that plugs into your ECM.

You should always have coolant temperatures in these ranges for a stock 'vette. Some may feel, myself included, that these temps are way to hot for optimal performance and part longevity. Based on the stated coolant temps posted above your '89 seems to running in the proper temp. range as designed.

 

200 is normal

 

I will look at the operation during hot days maybe look for the 215 swith , also what temp should i get alarmed by on a hot day stuck in traffic thanks

 

I have an 89 convertible with the heavy duty radiator and the aux fan. Per earlier replies, the fan kicks on at 228 and will pull the temps back down pretty quickly. My car will creep up to 210 and higher, by then, the light turns green and everything gets back down to 190ish or so.

 

If it gets higher than 240, you need to look at why. Normally, you'd start by taking the radiator out and thoroughly cleaning the fins. Can't be done in the car. That and a new thermostat should lower that temp.

 

Replace thermostat 185 last summer, I have to pull then clean the radiator. Thanks much C4CONV89,

 

This sounds my mine too.