I replaced the radiator in my 93 geo prizm, and now the heat only comes on half the time.. what could this be from?


Asked by Apr 07, 2014 at 04:01 PM about the 1993 Geo Prizm 4 Dr LSi Sedan

Question type: Maintenance & Repair

I have had more problems than i can count lately with this car. However, after tackling
what we thought were all of them this morning the radiator blew after replacing the heads
the gasket,  fixing the cams and the timing just over the weekend. Now we have replaced
the radiator and the heat only turns on when it wants to. Not sure what to think other than
possibly the heater core? Any ideas.... ??

4 Answers


Sounds more like you have an air pocket in the cooling system.


If that is the case, how do you bleed the air pocket out? Any ideas there.. thanks!

1 people found this helpful.

The best way is to have it refilled with a machine that refills via the heater hoses. But if you can't do it that way then you need to raise the car on the side that the radiator fill is located, slowly add coolant until it can't take any more, re install the cap, start the engine and check the fluid level add if needed, make sure the cap is on properly and run till the thermostat opens fully and the radiator hose on top is hot to the touch, that will tell you that the coolant is flowing and the thermostat is open then try your heater.

1 people found this helpful.
Best Answer Mark helpful

Thanks for your help def gunna try it!

1 people found this helpful.

Your Answer


Looking for a Used Prizm in your area?

CarGurus has 35 nationwide Prizm listings and the tools to find you a great deal.


Geo Prizm Experts

  • #1
  • #2
    Tom Demyan
  • #3
View All

Related Models For Sale

Used Toyota Corolla
571 Great Deals out of 66,738 listings starting at $1,449
Used Geo Metro
7 listings
Used Honda Civic
333 Great Deals out of 52,980 listings starting at $1,200
Used Geo Tracker
16 listings

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.