How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask classictech Your Own Question

classictech
classictech, Chevy Technician
Category: Chevy
Satisfied Customers: 220
Experience:  Dealer and manufacturer trained
10380991
Type Your Chevy Question Here...
classictech is online now
A new question is answered every 9 seconds

96 astro van overheating

Resolved Question:

Trouble with overheating astro. At times it warms up fine...tenp guage goes up to half...thermostat opens...temp falls back...at other times...the temp guage just keeps going up till hot...when that happens..coolant pours out from radiator area on the drivers side...but doesn't leak at any other time.
Submitted: 6 years ago.
Category: Chevy
Expert:  classictech replied 6 years ago.

Hi from justanswer!

The most likely cause of this is a sticking thermostat, which is located on top of the engine just below one end of the upper radiator hose.

Before you replace the thermostat, be sure that flow around the cooling systrem is normal. With the van warmed up (not overheating) turn the heater on high speed and hot. If you get plenty of hot air to the floor, then coolant is circulating properly through the engine and heater core. Until the thermostat opens, however, coolant is not sent to the radiator. When replacing the thermostat, be sure to flush the radiator itself and make sure it isn't blocked by any rust, gum or debris

If you do not have hot air coming into the vehicle through the heater, then there is a more serious problem. Either coolant is not circulating, or there is a bubble forming in the system when the engine is running. In either case, engine work is necessary for either a defective coolant pump, severe blockage in the system or a leaking head gasket.

Customer: replied 6 years ago.
Reply to classictech's Post: why does it leak sometimes and not at other times?
It only leaks water when it overheats....and from the drivers side...overflow is on passenger side.
Expert:  classictech replied 6 years ago.

tenbear, I was editing the post while you were reading - sorry.

There is a chance that coolant is leaking from the connection between the raditor and the overflow. Is the radiator cap on the opposite side?

I'm going to see if chat is working so stay tuned.

 

Expert:  classictech replied 6 years ago.

Chat not working. Hm.

Cooling systems can leak only under pressure. Your van should hold up to 16 psi but a pressure leak will let coolant out and air in after you drive it. If your overflow bottle stays full, it's because air is inside and pushing coolant back out of the bottle instead of sucking coolant back in.

 

classictech, Chevy Technician
Category: Chevy
Satisfied Customers: 220
Experience: Dealer and manufacturer trained
classictech and other Chevy Specialists are ready to help you
Customer: replied 6 years ago.
The cap is on passenger side...(Left looking from front) but leaks...(sometimes flows) from RIGHT side. It only does this when it overheats. If I don't have heating issues it does not leak. Never saw one leak sometimes. Bewildering
Customer: replied 6 years ago.
when it leaks I have to refill
Expert:  classictech replied 6 years ago.

You might have to home in on the leak and fix that before you can figure out any overheating issues. A coolant pressure test can make the system leak for you without you having to warm it up.

16psi is the rating of the radiator cap, so if antifreeze is coming out anywhere but the cap your level will drop until the van overheats. Also, if antifreeze leaks onto the radiator support, it can come out on the ground somewhere far away from the actual leak. A good look under the van will turn up anything obvois, but use a pressure tester instead of running the van. It's easier to inspect when it's not too hot to touch.

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
< Last | Next >
  • I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • Tim's Auto Repair

    mechanic

    Satisfied Customers:

    7641
    Have owned a repair shop for 25 yrs.
< Last | Next >
  • http://ww2.justanswer.com/uploads/TI/tim37857/2011-10-28_23053_S6301814.64x64.JPG Tim's Auto Repair's Avatar

    Tim's Auto Repair

    mechanic

    Satisfied Customers:

    7641
    Have owned a repair shop for 25 yrs.
  • http://ww2.justanswer.com/uploads/DT/dt69nova/2012-6-15_234154_pic1.64x64.jpg Dave Nova's Avatar

    Dave Nova

    Chevrolet Technician

    Satisfied Customers:

    6870
    ASE Master Certification. GM World Class Certification
  • http://ww2.justanswer.com/uploads/ggrote1/2009-06-27_031011_me.jpg Gary's Avatar

    Gary

    Chevy Technician

    Satisfied Customers:

    5404
    15 years GM master tech
  • http://ww2.justanswer.com/uploads/testedtuff/2009-09-26_170108_pictures.jpg John's Avatar

    John

    Master A.S.E Automotive technician

    Satisfied Customers:

    4071
    A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
  • http://ww2.justanswer.com/uploads/RO/rodcuda/2011-7-25_224114_Donhoff1.64x64.JPG Neal's Avatar

    Neal

    Chevy Mechanic

    Satisfied Customers:

    2306
    Shop Owner and Mechanic on multiple makes.
  • http://ww2.justanswer.com/uploads/goodwrench9124/2008-11-09_220838_dscf0007.jpg goodwrench9124's Avatar

    goodwrench9124

    ASE Certified Technician

    Satisfied Customers:

    2041
    Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer, Hybrid certified
  • http://ww2.justanswer.com/uploads/DR/drivefast1971/2012-1-12_172422_0009051tQKh.64x64.jpg Ron Z.'s Avatar

    Ron Z.

    - Chevy Tech -

    Satisfied Customers:

    1912
    18+yrs experience. State Inspector and Chevy Diagnostics