Question about 1988 Chevrolet Corsica

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Coolant fan relay... '88 Corsica 2.0

I have an 88 Corsica 2.0/5speed. I can't seem to find any info (books or online) where the Coolant Fan Relay is located. Thanks for your time!

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I have a problem with my car and i dont have idea where i can find these problem... the engine seems working properly and the oil is in good condition no burning smell, nothing mix of any kind of liquid and its a chevrolet corsica 1995. my problem is the tempereture gage is goes up and down, and the cooling fan does not working continieusly it does work but it takes a while to get running and the coolant is always getting low and i can't find any leakage. could you be so kind to tell me what wrong with this cace than you! john

Posted on Mar 19, 2009

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Trace the wire from the coolant fan motor back a ways. More than likely it's located behind the grille on a support near the radiator, between the radiator and the grille.

Posted on Dec 16, 2008

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I have 2001 dodge caravan 3.3L I am getting P1491code rad fan control relay curcuit. Replaced the relay still have same code

the above link contains test info for the circuit. 3 main problems if the fan itself is good:
1 ) corrosion in the relay socket..especially the ground
2) coolant temp sensor bad
3 ) relay bad

Jul 30, 2016 | Dodge Cars & Trucks

2 Answers


why not post symptoms first and not a barrage of parts.
must we decode that to a symptom,. kinda hard right.

I will not guess. what is wrong, nor what is not working on your car. now what fans you are talking about, up to 4 fans on cars.

cab blower fan (wild guess blower is ok) and so is HVAC, ?
radiator fans
Condenser fan.

my wild guess to , engine over heats?????????
if yes, the scan it first. no not last FIRST.
it dont work like you think its not a 1988 Samurai.
on modern cars, they got smarter, the engine goes
gee the PCM knows water temp why have a fan temp regulator.
hark , now it dont. (saves cash on useless parts)
but has a relay , (well until you have my car and the relay is now 100% electronic, called a huge transistor)
we've used this tech in industry for years, but car makers just learning how still.
i digress. but evolution and history helps diagnosis.
what is there?

Ill look for you, ive posted this 100s of times
the book is 4 bucks to see online. the real deal
lets look now.
XL-7 (the dash matters big time)
answering for , overheats engine, and fans on RAD dead.
(some are staged, PCM brains... now. and also chain ops based on if A/C is on or not) facts.
first I see 2 fans... ok.
the next page shows nice block diagram of the fan system
yup, NOT Simple.

ill post those words for you.
"The engine cooling fan system consists of 2 electrical cooling fans and 3 fan relays. The relays are arranged in a series/parallel configuration that allows the engine control module (ECM) to operate both fans together at low or high speeds. The cooling fans receive positive voltage from the cooling fan relays which receive battery positive voltage from the underhood fuse block.
During low speed operation, the ECM supplies the ground path for the low speed cooling fan relay which is fan 1 relay through the low speed cooling fan relay control circuit. This energizes the low speed fan relay coil, closes the relay contacts, and supplies battery positive voltage from the fan 1 fuse through the cooling fan motor supply voltage circuit to the left cooling fan. The ground path for the left cooling fan is through the series/parallel relay which is fan 2 relay, and the right cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. The ECM grounds the high speed fan relay, which is fan 3 relay, and the series/parallel relay, which is fan 2 relay through the high speed cooling fan relay control circuit. This energizes the series/parallel relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time the high speed fan relay coil is energized closing the relay contacts and provides battery positive voltage from the fan 2 fuse 1 on the cooling fan motor supply voltage circuit to the right cooling fan. During high speed fan operation, both engine cooling fans have their own ground path. The result is a parallel circuit with both fans running at high speed.
When the request for fan activation is withdrawn, the fan may not turn OFF until the ignition switch is moved to the OFF position or the vehicle speed exceeds approximately 16 km/h (10 mph). This is to prevent a fan from cycling ON and OFF excessively at idle.
end quote.

i bet you didnt scan it , like 99.9 % of all posters here dont.
DTC Descriptors
DTC P0480: Cooling Fan Relay 1 Control Circuit
DTC P0481: Cooling Fan Relay 2 Control Circuit
DTC P0691: Cooling Fan Relay 1 Control Circuit Low Voltage
DTC P0692: Cooling Fan Relay 1 Control Circuit High Voltage
DTC P0693: Cooling Fan Relay 2 Control Circuit Low Voltage
DTC P0694: Cooling Fan Relay 2 Control Circuit High Voltage
Diagnostic Fault Information

is the ECT showing overheat, yes no?
if yes, it must operate a fan or 2.
the book even covers all tests for fans dead, in a large truth table.
both the FSM and have that, its no secret ,its published in 4 major places.

lets back up
if the engine coolant is low (no that side tank the engine and rad)
the ECT will lie. if that happens the fans may not come one
that is because the ECT is useless measuring air, for water.
that water must touch ECT for ECT to work.
this is FIRST
then scan the ECT does it show overheating, IT must if it IS overheating. fix that next if it lies to you,(IR gun in hand)

The system has staged fans.
i cant find the trip points in my crappyy online pages.
but is like 225f then 250f trips. is my guess...
about. if the engine over heats, check fuses first then scan it.
it will simply tell you why its bad.
eg, fan1 output dead.
or if you hot wire a fan and its dead, then it is.
(only on cars with non modulated fans,,hot wire them,else not.)

now the link to the 4 buck real book.
the non dash XL7 (my guess) you this pick yourself... cant see car.

this is how it really works
the ECU has software that decide trip points for fans.
hard coded, this is. based on how hot it is and if A/C is on not.
its way smarter than 1988 and better.
the DTC errors can see an open line, shorted to ground or stuck 12v.(runs all time error)
(tells you relay is good or not)

25839272-0kjd5huq4lpr130nt243wle5-3-0.jpg no scanner no joy , sorry, tis a fact.....


Aug 27, 2015 | 2007 Suzuki XL-7

1 Answer

Where is the radiator fan relay in 1995 cherokee 4.0L inline 6

most 93 to 95 have viscus clutch not electric fan (A/C evap fan sure) but some do have the Aux fan too. and the PCM reports DTC errors, if the relay fails. did it? report that?
ok the 95 XJ with 4.0 does have fan.... have FSM in hand.
If the ECT has air pockets it well never report hot temps.
it will not energize the Fan relay if the ECT fibs. for any reasons.
page 35 Chapter 7
the viscous fan locksup at (165° to 180° F).
the electric fan is as follows.
i guess you never looked in the PDC before or its lables
"The fan is controlled by the cooling
fan relay, which is located in the power distribution
center (PDC). For the location of relay within
the PDC (Fig. 41), refer to the label on PDC cover"
and now AUX Fan , quote2.
"When coolant temperature is above 88°C (190°F),
the powertrain control module (PCM) provides a
ground path for the fan relay. This ground is provided
through pin/connector #31 of the PCM 60-way
connector. Battery voltage is then applied to the fan
through the relay. When coolant temperature is below
88°C (190°F), the PCM opens the ground path to
the relay. This will prevent the cooling fan from being
Whenever the air conditioning is operated, the
PCM engages the auxiliary cooling fan

given these facts? why not turn on A/C and end the guessing.

I use my scan tool , and innova 3140 for jeep OBD1.
it shows me what he pcm sees for ECT readings
if the engine is at 100C and the ECT shows way lower
its bad. or has air pockets around it,
no ect runs in air and works, none,.
if say the ECT is at 100C and the fan relay is not closed
the relay is bad or ECU driver to it blown. (bad ecu)
if the relay coil is hot, and the fan is not the relay is bad.

if the relay is closed and 12vdc out of it, then fan is dead.
if the fan is good (hot wired), and the relay out is hot , the wires are bad from relay to fan.
a $10 voltmeter and the guessing ends.

Jun 29, 2015 | Jeep Cars & Trucks

1 Answer

Wiring for 88 cadi fan

Well I'm sure there are kits to wire up electric fans on cars that are not designed for one.
You would need a relay and something to turn the relay on. A coolant sensor won't do the trick, the sensor is what tells the computer the engine temp, and the computer decides when to ground the fan relay.
You would need a temp switch that is designed to close at say 220 degrees to ground or power the fan relay.
The fan motor would have ground and power wires.

Sep 30, 2012 | 1988 Cadillac Sedan DeVille

1 Answer

Where is the cooling fan sensor on my 1995 chevy corsica

The computer takes info from the engine temp sensor to decide if the fan is needed. The temp sensor is on the intake manifold and has two wires. Check the relay too.

Aug 13, 2012 | Cars & Trucks

1 Answer

I have a 2008 Town and Country and the temp gage gets to dead center and I smell antifreeze. Never remember the gage ever reaching the center before either. So I Checked to see if the radiator cooling fan...

ok this might sound crazy but you say you smell coolant but never said if you checked to see if it was full posible bad coolant temp sensor or no coolant passing the sensor please more info on coolant usually if low coolant fan will stay on however you say you smell coolant. If the coolant sensor is bad fan wont command on it will have a high resistance a low coolant temps and low at high temps. I would check sensor since its obviously getting hotter than half way if you dont have coolant leak the relay behind the head light by the way is a common problem I would have just changed it if its original and it grounds to body thats why it is riveted however you can bolt them. Hope this helps check for thermostat opening at right temps to.

Jan 07, 2011 | 2008 Chrysler Town & Country

1 Answer

The engine seems to be getting hot. Is there a fan sensor that could be causing the problem?

if the fans were working good before. check the fuses or fan relay in fuse box. if ok. see if power is getting to fan( car on engine off ) at the fan connection. to test fans if need be. run a wire from positive on fan motor to positive on battery, then ground other connection to a suitable ground or the negative post on battery. if the fans are ok. here are a few causes--- defective thermostat stuck open ( engine does not get hot enough to turn fan on ) . a failed fan relay, or a bad fan motor! or engine coolant tempurature sensor is bad. have a good day !!

Dec 20, 2010 | 1992 Chevrolet Corsica

1 Answer

Code p1652 on a 1996 pontiac grand prix does anyone know what it means the book for computer codes is incomplete

Trouble code P1652 means: Cooling Fan 2 Relay Control Circuit Malfunction

I would start by checking power supply to the cooling fans,making sure the coolant system is full,& using a scn tool to verify the proper operation of the cooling fan system.Here is some info to help you.

The Powertrain Control Module (PCM) controls the operation of the cooling fans. This is accomplished by providing a ground path for the cooling fan relay coils within the PCM. The relay contacts will close and complete the circuit between the fusible link at the battery junction block and the fan motors. Whenever there is a fan ON request both fans will be running.

Power for the fan motors is supplied through a fusible link at the battery junction block. Battery positive voltage is applied to the cooling fan relay contacts and coils. The cooling fan relays are energized when current flows through the relay coils to ground at the PCM. The cooling fan relay #1 control circuit is used for low speed cooling fan operation. The cooling fan relay #1 control circuit and the cooling fan relay #2 and #3 control circuit are both grounded for high speed fan operation. The cooling fan relay control circuits are monitored by the PCM. Before using the Electric Cooling Fans diagnostic tables be sure to perform the Powertrain On-Board Diagnostic System Check. If diagnostic trouble codes P1651 or P1652 are present, use the appropriate DTC diagnostic tables prior to performing Electric Cooling Fans diagnostics.

When certain Diagnostic Trouble Codes (DTCs) are present, the PCM may command the cooling fans to run all the time. It is important to perform the Powertrain On-Board Diagnostic System check prior to diagnosing the engine cooling fans.The PCM will complete the ground path for cooling fan relay #1 under any of the following conditions:
- When engine coolant temperature exceeds 105°C (221°F)
- When A/C is requested and ambient temperature is greater than 10°C (50°F)
- When A/C refrigerant pressure is greater than 190 psi (2 volts)

For high speed cooling fans operation, the PCM will delay control of the cooling fan #2 and #3 relays for 6 seconds. The 6 second delay ensures that the cooling fan electrical load will not exceed the capacity of the system. The PCM will complete the ground paths for cooling fan relays #1, #2, and #3 under any of the following conditions:
- When engine coolant temperature exceeds 113°C (235°F)
- When A/C refrigerant pressure is greater than 275 psi (2.9 volts)

If a problem that involves the low speed cooling fan relay control circuit (cooling fan relay #1 control) exists, DTC P1651 should set. If the problem affects the high speed cooling fan relay control circuit (cooling fan relay #2 and #3 control), DTC P1652 should set. A problem with the ECT sensor should set DTC P0117, P0118, P1114, or P1115. Any of these DTCs will affect cooling fan operation and should be diagnosed before using the Electric Cooling Fan Diagnosis table. The Electric Cooling Fan Diagnosis table should be used to diagnose the PCM controlled cooling fans only if no DTC is set.
Hope this help to solve your poblem (remember rated and comment this help).

Mar 21, 2010 | 1996 Pontiac Grand Prix

1 Answer

Auxilliary electric fan on radiator won't switch on. Temp sender unit reads very low (boiling at halfway up the operating range). Could that be the problem? i.e. won't activate a relay? subaru L series...

i cannot find the service info i need for this vehicle..i would then probably start by installing a test light to both wires at the fan to see if it was getting current. if it is the fan motor is bad. hard part. if it is not recieving current,ceck the fuzes,find the relay,use a volt meter or test light to find the 12v supply wire.and wire it to the fan,fan should come on.the other terminals will turn on the relay.sometimes the relays will have a picture on the side of them to show how they work,home free.follow that to connect your volt meter to those terminals to see if they are receiving voltage to turn on the relay when hot engine occurs.if they do the relay is bad.on soom cars there will be several relays with the same part number on tem temporarlly swap these to verify.. if there is no current to turn it on the temperature switch or wiring could be bad. there may be more than one temp. switch on the engine or scewed into the manual shows a temp switch in the center of the intake manual.the wiring diagrams i have dont even show the radiator fan. sorry.go to your library maybe they have an online acess to a auto repair manual site.all-data or mitchell online these are not available free on your can go to mitcell online and pay for a one week use ror your car but i have the printed books for that year and there is no info on the cooling fan operatio,odd?

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2 Answers

Sunfire overheating, not low on coolant

Sensor on the engine sends info to the computer that triggers fan relay and sends power to fan. Most often problem is sensor or relay but quick check fan itself by hot wiring it to the battery Polarity is not an issue...if you get wrong it will run backwards. If it does not run, it's bad.

Jul 30, 2009 | 2001 Pontiac Sunfire

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