No Heat

knights89
35

Asked by Jan 06, 2013 at 08:18 PM about the 1997 Chevrolet Express G1500 LS Passenger Van

Question type: Maintenance & Repair

Hello Everyone,
I have a 97 Express with a 4.3.  In November, I noticed very little heat was coming from the vents.  
First thing I figured was the heater core.  Checked it, OK. I noticed the engine temperature was only
going upto the second large line on the temperature gauge (the one between 100 and 210 - there's
no number). Must be the thermostat.  Bought a new one, flushed the system, new coolant. No change.
The air door for the heater core moves, so I know its not that. I then checked the hoses, they do not
get that hot. I use the van daily, as well as driving approximately 300 miles each way every few
weeks to get my son from college (just did it this weekend), and the engine temperature does not rise
above that line.  I believe the gauge and sensor are working because the hoses do not get hot. Any
ideas? Thanks for any help.

8 Answers

Michael Mierzejewski
3,020

Check your mechanical fan. It should be spinning much slower than your engine, or even staying still, if the clutch is performing correctly. If the fan is constantly on, this will limit coolant temp, not to mention rob fuel economy. Also check that your electrical fans are off unless commanded on by the AC system or when cooling is needed. If theyre always on, your ECT sensor is likely sending the wrong input to the computer and commanding the fans on too soon.

1 out of 1 people think this is helpful.
tenspeed
85,935

Which hoses are not that hot? If it's the heater core hoses, the core could be plugged. If it's the radiator hoses that are not hot, the thermostat could be stuck open.

3 out of 3 people think this is helpful.
Anthony DeRose
1,725

You can back flush the heater core with a water hose, one way then the other, until the water comes out clean. Try not to let the water pressure going into the core get much over 20psi.

1 out of 1 people think this is helpful.
knights89
35

Thanks guys, I will check and let you know.

knights89
35

Ok I checked the fan, thank you Michael. Before I started the engine (it was cold) the fan was somewhat stiff. I could turn it, but when I let go, it would immediately stop. When I started the engine, it turned quickly - I could not stop it with my hand. After 15 minutes, the fan was rotating the same (fast -could not stop it) and the hoses are all still cold. after shutting the engine off, the fan stopped, and was the same as when I started (stiff). Should the fan spin freely, or is this normal?

Michael Mierzejewski
3,020

With the engine off, you should be able to spin the fan easily by hand, but there should be slight resistance. It should stop spinning after one full turn or so. If it spins with no resistance and keeps going several turns then the clutch is bad.

knights89
35

I have changed the fan, it spins freely but there is no difference in the engine temperature. What else could it be? Thanks

1 out of 1 people think this is helpful.
knights89
35

bump

2 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions

  • Over heating 4 answers

    I have a 2008 Chevy express van 5.3 vortex engine. About this time last year I replaced the water pump and put a new thermostat in twice. Well it started running hot again two weeks ago. I replaced...

    2008 Chevrolet Express

    -

    Maintenance & Repair

  • 2004 Chevy express van 2500 no heat 4 answers

    I have a Chevy Van with no heat. Long story. Started with the A/C in the summer. It would only come on if i hit a bump in the road. The jolt must have done something. That went on for a while. Now...

    2004 Chevrolet Express G2500 Passenger Van

    -

    Maintenance & Repair

  • Leaking water pump replaced. Now no heat and overheating? 2 answers

    My 2004 Chevy express 3500 box truck was leaking water out of what appeared to be the water pump. I purchased a new pump and thermostat. After replacing the pump and filling the radiator I started e...

    2004 Chevrolet Express

    -

    Maintenance & Repair

  • 2010 Chevy express 3500 No front or rear heat or air 1 answer

    Neither front or rear blower motor ac or heat is working on my parent's 2010 chevy express 3500 van. When we set it so that it blows outside air, neither the heat or air works in the front or rear, a...

    2010 Chevrolet Express

    -

    Maintenance & Repair

  • heat 4 answers

    Replaced blower , but no heat or air cums out. What else would i need too replace for heat too work & actually blow out?

    2004 Chevrolet Impala Base

    -

    Maintenance & Repair

Express

Looking for a Used Express in your area?

CarGurus has 5,442 nationwide Express listings starting at $1,995.

ZIP:

Search Chevrolet Express Questions

Chevrolet Express Experts

#1 tenspeed
tenspeed
Reputation 220
#2 dizybren
dizybren
Reputation 180
#2 Fernando Martinez
Fernando Martinez
Reputation 180
View All

Related Models For Sale

Used GMC Savana"
9 Great Deals out of 1,402 listings starting at $4,800
Used GMC Savana Cargo"
72 Great Deals out of 4,015 listings starting at $3,495
Used Ford E-350"
269 listings starting at $2,900
Used Chevrolet Suburban"
486 Great Deals out of 23,448 listings starting at $1,295
Used Chevrolet Astro"
356 listings starting at $1,998
Used Chevrolet Tahoe"
801 Great Deals out of 34,398 listings starting at $1,500

Used Cars For Sale

2017 Chevrolet Express For Sale
549 listings starting at $27,912
2016 Chevrolet Express For Sale
2,061 listings starting at $23,550
2015 Chevrolet Express For Sale
24 Great Deals out of 735 listings starting at $20,185
2014 Chevrolet Express For Sale
14 Great Deals out of 433 listings starting at $8,200
2013 Chevrolet Express For Sale
5 Great Deals out of 192 listings starting at $8,999