Leaking water pump replaced. Now no heat and overheating?

10

Asked by Mar 28, 2015 at 07:10 PM about the 2004 Chevrolet Express

Question type: Maintenance & Repair

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 engine to come up to temp. Never seemed like stat opened,
water level only went down slowly. After engine temp started climbing over normal I
turned on heater and no heat at all, just cold air.  With engine climbing above operating
temp I was thinking new stat is no good but with no heat I'm wondering if something
else?

3 Answers

30

Just by taking a wild stab at it, I would guess that you have a TON of air in the system. If there is enough air in the system, it basically becomes vapor locked, especially in the newer engines. Best way maybe to remedy this would be to take the thermostat back out, fill the block VERY slowly with antifreeze where the stat goes until its full, put the top radiator hose back on the stat housing, then fill the hose just enough that you wont spill it everywhere when hooking it bck up to the radiator, then fill the radiator VERY slowly also. That should do the trick. They also make thermostats that are guaranteed not to stick closed if your worried about that. Hope this helps

3 people found this helpful.
10

Thank you. That makes sense. I will give that a try.

1 people found this helpful.

What TY said is correct . I experienced same problem. I took the hoses off. Filled as much as I can slowly with coolant . Started the van. Let idle with few revs all is good

Your Answer:

Express

Looking for a Used Express in your area?

CarGurus has 4,344 nationwide Express listings starting at $4,500.

ZIP:

Chevrolet Express Experts

  • #1
    tenspeed
    Reputation
    310
  • #2
    Sarai Sanchez
    Reputation
    290
  • #3
    dizybren
    Reputation
    280
View All

Related Models For Sale

Used Chevrolet Express Cargo
69 Great Deals out of 6,274 listings starting at $2,450
Used GMC Savana
5 Great Deals out of 1,123 listings starting at $3,499
Used Ford E-Series Wagon
21 Great Deals out of 1,067 listings starting at $2,500
Used Chevrolet Silverado 2500HD
382 Great Deals out of 30,227 listings starting at $3,000
Used GMC Savana Cargo
29 Great Deals out of 2,574 listings starting at $1,800
Used Ford E-Series Cargo
82 Great Deals out of 3,337 listings starting at $1,500
Used Chevrolet Silverado 1500
1,741 Great Deals out of 153,480 listings starting at $1,000
Used Chevrolet Suburban
315 Great Deals out of 22,531 listings starting at $1,900
Used Ford Transit Cargo
91 Great Deals out of 16,175 listings starting at $10,900
Used Ford F-150
2,281 Great Deals out of 208,435 listings starting at $1,300

Used Cars For Sale

2017 Chevrolet Express For Sale
1,347 listings starting at $18,990
2016 Chevrolet Express For Sale
454 listings starting at $14,950
2015 Chevrolet Express For Sale
6 Great Deals out of 245 listings starting at $9,995
2014 Chevrolet Express For Sale
8 Great Deals out of 252 listings starting at $8,990
2013 Chevrolet Express For Sale
119 listings starting at $9,995

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.