What do I do about my car running hot?


Asked by Benmotes Jul 30, 2014 at 11:39 PM about the 1994 Geo Prizm

Question type: Maintenance & Repair

I have a 94 geo prizm that keeps
running hot. The water pump is good.
I just gutted and put a brand new
thermostat in it. I was told my heads
could be going out to put some block
seal in the radiator so I followed the
instructions on the bottle and its still
running hot. When I first start the car
up it runs perfect for about 5 to 10
miles then starts running real hot so
what do I do?

7 Answers

Colin Rivet

how old is the radiator,it could be blocked.


I really have no clue! It looks newish maybe a couple years or so but idk


If its blocked how do I unblock it?


Never ever ever put any type of sealer in your cooling system, it causes more problems than it cures, plugs radiators, heater cores and smaller water passages in your engine. Have the engine block checked, that will tell you if you have a head problem or not. Just the way you stated you problem I would say that you have a radiator problem, slow coolant flow internally or plugged cooling fins externally.

Best Answer

Get it flushed or just replace it. They cheap and a new one will out last your 20 year old Geo.


How cheap is a new radiator?


$100.00 or less. Look online and check out EBay.

Your Answer

Add photo

Related Questions

  • 94 geo prizm running hot 9 answers

    What do I do about my car running hot? I have a 94 geo prizm that keeps running hot. The water pump is good. I just gutted and put a brand new thermostat in it. I was told my heads could be going...

    1994 Geo Prizm


    Maintenance & Repair

  • WHy won't my Prizm start after running and getting warm? 1 answer

    I have a 1997 Geo prizm. It stalled on me going to work the other day and would start back up. It sat for about 2.5 hours before my boyfriend got there to look at it and it started right up for him. ...

    1997 Geo Prizm


    Maintenance & Repair

  • 1994 Prizm runs hot at high speeds 1 answer

    No leaks. At high speeds it runs hot and blows the coolant to the overflow reservoir. Top hose hot and lower hose cool. Heater blows hot air and the fans work fine. Changed thermostat twice. No water ...

    1994 Geo Prizm 4 Dr LSi Sedan


    Maintenance & Repair

  • What would cause my Geo Prizm not to start when it is cold or damp? 1 answer

    Hi, I have a 1994 Geo Prizm 1.6L automatic. It runs and drives well. However, when it is below 60F or damp/humid outside (like after a heavy rain during the night), my Prizm will crank and crank but...

    1994 Geo Prizm 4 Dr STD Sedan


    Maintenance & Repair

  • Will not pass smog in california what fair price 7 answers

    What is a fair price the Geo will not pass Smog in california I believe it is the cat or oxygen sensor 70.00 for cat and 29.00 of o2 sensor ive seen. 130,000 miles and dented a low eye appeal but runs...

    1994 Geo Metro 2 Dr STD Hatchback


    Shopping & Pricing

Looking for a Used Prizm in your area?
CarGurus has 67 nationwide Prizm listings and the tools to find you a great deal.

Search Geo Prizm Questions

Geo Prizm Experts

#1 Tom Demyan
Tom Demyan
Reputation 130
#2 CamaroCollector
Reputation 110
#3 FordNut
Reputation 90
View All

Related Models For Sale

Used Toyota Corolla"
1,111 Great Deals out of 71,118 listings starting at $2,475
Used Honda Civic"
841 Great Deals out of 57,556 listings starting at $999
Used Toyota Camry"
1,214 Great Deals out of 85,128 listings starting at $999
Used Honda Accord"
960 Great Deals out of 74,162 listings starting at $1,295

Used Cars For Sale