Question about 1990 Geo Prizm

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Fan runs all the time when car is on

I put my motor from a 91 geo prizm into a 90 geo prizm body but now when ever the car is on the fan is always running is the wiring different or what could it be?

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I did the same thing and had the same problem. I believe I replaced a ten amp fuse in the engine compartment and fixed it. Really pissed me off.

Posted on Nov 01, 2008

  • kelsey marsh Jan 30, 2009

    Bad ground. That"s what it was.


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Starts after a push start but won't keep running. 1993 Geo Prizm. Why?

what engine, 1.6L or 1.8L 4a or 7a toy engine?
prizm= corolla.. so....
no matter
ever get a full tune up this decade, cures like 90% of that.

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It is defiantly AN ELECTRICAL PROBLEM. Try checking your fuses, use a DMM to test for continuity. I have had fuses look good but fail the continuity test.

Apr 12, 2014 | 1994 Geo Prizm

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Does a 1993 geo prizm 1.8L lsi have two temp sensors?

buy the manual. and RTM,
and yes, Air , water, and on a stock car up to 3 coolant sensors.
The ECT runs the ECU. tells ECU coolant temp.
my guess is the coolant gage is dead? RTM
on most 93 car, the Guage has its own sensor, (isolated)

joint venture, GM/toyota with 3 engine used.
1.8L or 1.6L
toy engine, 4aFE, 7AFE or 4AG
open hood look
or use the GM RPO tag
or Use the VIN to find motor used.
for docs?
Geo Prizm factory service manual, Duh?;jsessionid=D19D723C2EDB4A9FE12E7C01C0677129?_sacat=0&_nkw=geo+prizm+shop+manual&_nkwusc=geo+prizm+shop+manaul&_rdc=1

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Where is the fuel rail located on a 1995 geo prizm ?

ok a joke, cant resist: sorry,,,, keep a smile!
under the hood?
above the 4 injectors? LOL im still joking but is true.
My best PRIZM post yet (working up to better soon)
now the straight skinny? no joking..
this Toyota in sheep's clothing has more than one engine option.
infact 2, (wiki, the Geo prizm and see that ) see gen 2.
the one time, there is no rail is if the car has TBI
throttle body injection, (ours is not)
if in USA and not Canada.? you never said,
EPA force (USA) the 1.8L the 7A-FE (toy engine)
I think this is a 4 injector MPI engine. Not TBI, see link.

I do not know what GM (Geo) changed on that 7A motor.
about 1995 all TBI was banned here. (dirty smog)
(did geo run custom ECU's , i think not, but may run custom tuning "ecu tables") i metion all this for when buying used parts.
so how to tell?
open hood, see intake manifold
see those runners, see them go to the head?
just before those runners contact the head,are INJECTORS x4
and above the injectors is the common rail.

if Geo works out like most of my experience with them.
they used all the toy parts, engine and EFI. and ECU.
so studying this would help.

wiki quote.
In the United States, the 7A-FE's most common application was in the 1993-1997 Corolla (7th generation).

google image seach nets.

see right view> see upper left side of engine
see that black air path. just end of tunnel, is the injector x4
and rail above that.
alldata dot com has all this.
free , try here.
heck even post. Gen2 GEO = Gen 7 toy

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1 Answer

1984 Geo Prizm run but drumping to too much gas

Might be anything but first I will inspect and replace the air filter. Other reason might be a lover compression test result. If it is 70 psi, then engine hesitates, but some people continue to drive and when it goes down to 60 psi the engine refuses to run .
One more reason might be ignition timing and the strength of spark. The distributor, wires and spark plugs have to be inspected, and replaced if necessary.
Finally another reason might be valve timing. This is related with the timing belt. If this is replaced please disregard this. I had a 90 ties Geo Prizm, and was making an average 30 miles per gallon.
Gradually dropped at 26 mile per gallon. I replaced the timing belt and a I got again 30 miles per gallon.
If your car will be sent in our car repair shop, these will be the first tests we will perform, to find the problem. Geo Prizm is a nice car, and very easy to take care with. If you will check this points by yourself, then you can save money and hope solve your problem.

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How do I replace the Timing Belt on my '91 Geo Prizm?

Remove all nessary parts to access cover. Remove cover. Line up the timing makrs before removing old belt if car is still in running condition. Loosen the belt tensioner and remove belt. Install in reverse order making sure to load tension back on belt at the tensioner.

Mar 05, 2010 | 1990 Geo Prizm

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When the engine is not running the belt is not turning the ac compressor which will not blow cold air unless ac pump is running so engine has to be running

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1992 Geo Prizm fan

your relay fuse is going bad replace it asap or your going to have to replace your head gasket next

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