what happens when car runs without radiator cap on

Asked by May 05, 2013 at 09:06 PM about the 1996 Chevrolet Lumina 4 Dr STD Sedan

Question type: General

car was run with out radiator cap on want to know what damage was done car is over heating after ten minuets of driving

8 Answers

325

The damage could be anywhere from minimal to head warpage. I'd recommend getting your car inspected for damage by a licensed mechanic. Best wishes! -Jackie

1 out of 1 people think this is helpful.
24,115

An automobile engine needs a cooling system to remove heat. For the system to work correctly, it must be self contained--sealed because it uses pressure to function properly. The pressure keeps the coolant from reaching a boiling point as quickly. As the temperature increases the coolant becomes steam. Without a radiator cap, the liquid overflows. Engine overheating can have devastating consequences. The engine begins to "ping" and lose power. This can cause piston, ring and rod bearing damage. Pre-ignition can occur, which creates weak places or "hot spots" which could burn holes in the pistons. Blown head gaskets can occur, cams can freeze up and break. Hoses and radiators can burst.

15 out of 15 people think this is helpful.
101,795

I agree with all the above. Cap must be good and proper pressure to work properly. Does it over heat while normal driving or does it mainly happen when you come to a stop and idling? If it happens after you stop check to see that your fan is running. It should come on at idle if temp is getting to high.

3 out of 3 people think this is helpful.
10

First thing is to now change your thermostat... I had a Chev Wagon 1989 and it needed that... If your car is older then the rad may be now pooched. if you look at the rad and run your fingers across the bottom rad weaves they may be no longer connected. Replace with a 2 core Rad. Also consider a transmission oil cooler... Makes a better running car and your tranny and alternator will last longer. If you have an older than 86 forget the car, Head gaskets blow when overheated.

1 out of 1 people think this is helpful.
90,125

"what happens when car runs without radiator cap on" - it depends on how long it was off and what happened. When the cap is off, the coolant boils at a lower temperature. --- Full the reservoir, put the cap on and see what happens.

8 out of 8 people think this is helpful.
1,285

You Wrote: ......." car is over heating after ten minuets of driving "....... I'm assuming, that after refilling the cooling system, and replacing the radiator cap, the car overheats after 10 minutes. Question: After refilling the cooling system, Does the coolant Stay in the system, or is it leaking out of the block or radiator, somewhere other than the radiator or coolant recovery tank???.........if the Coolant is staying in the system, and the car seems to run fine, but overheats after 10 Minutes.....Replace Your Thermostat....... it's very possible it's Stuck Closed........ it's True as previously stated..... all sorts of Evil can happen to your engine, after it has a serious Over-Heatage..... my sweetheart once drove down the highway for quite a while in my old '91 Pontiac Sunbird with a 3.1/V6, before noticing the red lights on the dash..... surprisingly, everything was fine..... I changed the Thermostat anyway.... it's Good Policay to do so, after an Over- Heatage...... after you change the thermostat, add a good quality cooling system sealer (in case you have a minor leak somewhere, like at a freeze plugh), and refill the system. Run the engine. Check for Leaks. On top of your Thermostat Housing, there may be a small fitting, it's an air bleed valve. If it's there, open the bleed valve, til no more air comes spitting out of it... keep an eye on the coolant level. In fact, if everything works out OK, keep an eye on the coolant level for days, since there might be more air in the system, even after bleeding. Also, keep an ear out, and inspect regularly for leaks, your water pump, especially underneath. They too often go bad when they are run dry after an overheatage. Good Luck! .......I hope everything is Cool! ......sorry, just had to add that....... jvb.......PS. if everything works out OK, change your oil, it too may have gotten cooked as well.

6 out of 6 people think this is helpful.
20

I had This problem Today I pore the coolent and forgot to fix the Radiator cap as a result My Radiator Runs Hot on every Signal Light and smoke Is coming out from the Radiator So I stopped My vehicle and Purchased Coolant and Radiator cap. Now it is working fine

2 out of 2 people think this is helpful.
20

I must be stupid. Besides the radiator cap there is a drain hose, open to the air. It is almost the same to work without cap.

2 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions

Lumina

Looking for a Used Lumina in your area?

CarGurus has 233 nationwide Lumina listings and the tools to find you a great deal.

ZIP:

Search Chevrolet Lumina Questions

Chevrolet Lumina Experts

#1 90V6RedHotLuminaEuro
90V6RedHotLuminaEuro
Reputation 1,150
#2 Justin Hatfield
Justin Hatfield
Reputation 1,140
#3 John Saffrahn
John Saffrahn
Reputation 1,030
View All

Related Models For Sale

Used Chevrolet Impala
996 Great Deals out of 36,810 listings starting at $1,800
Used Chevrolet Malibu
1,157 Great Deals out of 80,725 listings starting at $2,495
Used Chevrolet Monte Carlo
17 Great Deals out of 1,734 listings starting at $1,695
Used Honda Accord
1,263 Great Deals out of 78,832 listings starting at $969
Used Chevrolet Caprice
174 listings starting at $10,900
Used Chevrolet Cavalier
1,376 listings starting at $1,000
Used Buick LeSabre
9 Great Deals out of 2,368 listings starting at $1,768
Used Chevrolet Tahoe
1,084 Great Deals out of 32,099 listings starting at $1,495
Used Ford Taurus
364 Great Deals out of 22,720 listings starting at $1,499
Used Buick Century
1,091 listings
Used Pontiac Grand Prix
31 Great Deals out of 3,796 listings starting at $1,195
Used Buick Regal
208 Great Deals out of 11,280 listings starting at $1,995
Used Nissan Maxima
513 Great Deals out of 25,501 listings starting at $1,500
Used Chevrolet S-10
12 Great Deals out of 1,646 listings starting at $995
Used Honda Civic
1,172 Great Deals out of 67,655 listings starting at $1,500