98 Chevrolet Astro Van overheating


Asked by Jan 09, 2014 at 05:11 PM about the 1998 Chevrolet Astro

Question type: Maintenance & Repair

Not a great mechanic but tryn to troubleshoot cheap stuff before I take anywhere. Girlfriends Astro Van ran hot two nights ago..It was 10 degrees due to the polar weather deal and she left work at 1 am and drove about 7-8 miles and it redlined on the temp gauge so she pulled over and I picked her up. Drove it the remaining 5 miles the next day but temp starting getting really hot when pulled in driveway..She has had a very small leak for over a year and tops off the coolant every 5-6 weeks so its a small leak..Anyway, shes just been using water so I thought maybe it just froze up with the dramatic drop in temp for first time this winter and probably has more water than antifreeze in it at this point..I heated it up in my garage for a day, drained all the antifreeze/water out and flushed it with hot water and then refilled with just water to let it circulate and check for leaks or if drain/freeze plugs had came out.. No leaks anywhere but just in the ten minutes I had it idling temp went up to 240 in 10 minutes..Its 50 degrees outside also..So obviously the water isn't circulating, I'm thinking possibly the water pump although it was replaced last summer, is there anything else I could check first? Someone had mentioned I may need to bleed the air out of the radiator or something like that as its lost its prime or something. Anyway, just asking for ideas, or even could the freeze have caused the thermostat to malfunction or stick? Any help is appreciated. Thanks

6 Answers


It could be the thermostat. Is the heater working ok (blowing hot air) when its starting to overheat?

2 people found this helpful.

No, it stopped working that night as well. Well, it blows air, but just cold air since that night.

1 people found this helpful.

Using to much water in the coolant mixture might have caused the thermostat to built up rust and stick closed. They are easy to replace. if this is the cause of the problem it would be your best case scenario.

2 people found this helpful.

When first reading the issues, my first thought was water and no antifreeze so in cold weather the radiator froze and no circulation. Second guess would be a blockage of the radiator preventing air from flowing through the radiator fins. (snow or cardboard obstruction.) These would be the easy fix. Then as steveq stated above, your thermostat is closed sue to rust or just being tired and refusing to work. Since you don't get warm air into the heater, water is not flowing, so it points to the thermostat issue. IF replacing that does not fix the problem, the water pump is the other answer to the problem. Using water also may have clogged the radiator with rust or hard-water calcium deposits and either a new radiator or having it rodded out if that is still done these days will work.

3 people found this helpful.

Thanks for the info! Changed the thermostat today and so far no problems, not running hot and heater is blowing hot air again so i got my fingers crossed. THanks!

3 people found this helpful.

Glad we could be of assistance. Stay warm my friend.

1 people found this helpful.

Your Answer


Looking for a Used Astro in your area?

CarGurus has 200 nationwide Astro listings starting at $1,688.


Chevrolet Astro Experts

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

Related Models For Sale

Used Chevrolet Astro Cargo Van
100 listings starting at $2,495
Used GMC Safari
95 listings starting at $1,800
Used Chevrolet Express Cargo
72 Great Deals out of 7,062 listings starting at $1,995
Used Chevrolet Express
33 Great Deals out of 4,431 listings starting at $3,000
Used Chevrolet Silverado 1500
1,781 Great Deals out of 149,286 listings starting at $1,495
Used Chevrolet Suburban
382 Great Deals out of 22,381 listings starting at $1,132
Used GMC Savana
3 Great Deals out of 1,164 listings starting at $4,995
Used Chevrolet Tahoe
528 Great Deals out of 36,655 listings starting at $1,375
Used Ford F-150
2,344 Great Deals out of 215,477 listings starting at $1,300
Used GMC Safari Cargo
24 listings
Used Chevrolet Camaro
224 Great Deals out of 28,922 listings starting at $3,900
Used Honda Odyssey
300 Great Deals out of 36,584 listings starting at $1,400
Used Chevrolet Blazer
4 Great Deals out of 714 listings starting at $900

Used Cars For Sale

2005 Chevrolet Astro For Sale
22 listings starting at $4,000
2004 Chevrolet Astro For Sale
9 listings starting at $2,995
2003 Chevrolet Astro For Sale
28 listings starting at $1,995
2002 Chevrolet Astro For Sale
25 listings starting at $3,300

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.