high flow thermostat
#1
high flow thermostat
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.
#2
Supreme Member
iTrader: (2)
Re: high flow thermostat
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:
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:
Last edited by Tootie Pang; 05-25-2017 at 04:33 PM.
#5
Junior Member
Join Date: May 2017
Location: Alberta Canada
Posts: 65
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1991 Firebird
Engine: 5.0 TBI
Transmission: T5
Re: high flow thermostat
you can by thermostats that work at different temp ranges. You may have one to hot for your car/climate.
Thread
Thread Starter
Forum
Replies
Last Post
newbvetteguy
Alternative Port EFI Intakes
54
06-02-2020 04:31 PM
RABMAN
Camaros for Sale
0
09-25-2016 10:44 AM
Dan87IROC-Z
Aftermarket Product Review
17
09-17-2000 08:53 PM