Question about 1998 GMC Safari

1 Answer

Heater only blows cold air. I have replaced the thermostate and blown clean the heater core. also replaced a control switch ($280). Sick of getting ripped off.

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 645 Answers

When the van is warmed completely check the top radiator hose by squeezing it together. If you can squeeze it without any resistance replace the radiator cap. The coolant is not circulating properly and can keep the heater from working. If you cannot squeeze the hose together than you may have a bad water pump. The water pump has fins inside of its' case. Those fins may be rusted completely off to where the water cannot circulate. You can check the circulation by feeling the top and bottom hose coming off of the water pump to the radiator. Both those hoses should be the same temp. If not I would consider changing the water pump.

Posted on Mar 11, 2011

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

2002 Ford Taurus, Heater blows cold air?


What have you checked so far ?
Radiator full of coolant ? Heater hoses getting hot ?

Feb 23, 2015 | 2002 Ford Taurus

1 Answer

Will not blow hot air when heater is on only cold air


You most likely have a blockage in the heater core. This can be blown out, although the replacement of the core is not prohibitively expensive, especially if you do it yourself. The heater core is where I would start looking, although I would only replace it if I wasn't able to flush clean water through it.

Jan 08, 2014 | 1992 Buick Roadmaster

1 Answer

HEATER NOT WORKING


The complete removal is shown in this youtube video.
http://www.youtube.com/watch?v=vLdMYx6fhic

So you're getting heat but no blower to circulate the heat, right? It's also possible the fuze is blown to the blower motor, the switch that adjusts the speed of the motor could be damaged, or its resistors that limit voltage, to control speed could be "open" (burned up). I would check many of those before replacing the fan..

The heat is controlled by a valve that allows water to circulate through the heater core. If the fan is blowing cold air, check the valve, or blow water back and forth through the heater core to clean it out.

Jan 05, 2014 | 2000 Chevrolet Malibu

3 Answers

My heat in my jeep just stopped working


need to make sure you have enough coolant and if it does then it could be your thermostate or clogged heater core

Feb 17, 2013 | 2007 Jeep Wrangler Unlimited Rubicon 2...

1 Answer

1997grand voyager is blowing cold air new thermostate water pump and the raditor and heater core has been back flushed it started blowing hot air again then went back to blowing cold air again


I would look for a vacum leak on the control valve for the heater. There are 2 lines from the radiator leading back to the firewall. One has a control valve on it that should be vacum controlled. When you back flushed to the heater core you may have forced this valve open temporarily. The control may have low vacum or insufficient vacum to open a stuck valve. The good news is you can actually manually open this valve and tie it in the open position which will at least temporarily solve the problem. Check your vacum lines for leaks and check the valve to make sure it isn't sticking.

Jan 21, 2010 | 1999 Plymouth Grand Voyager

2 Answers

Heat dont work might be bad hoses or put on wrong need diagram on how it goes 1993 Chevy K1500 getting sick of the cold


The hoses are two different sizes.One will be 3/4 and the other 5/8.No way to mix them up.May be your blend door not opening alowing air to flow across your heater core.I am not sure if there is a mixing/control valve.Feel both heater hoses as well as your top radiater hose just to make sure that the thermostate is not bad.You can look on napaonline.com and search "heater"to get a look at the door motor.You can remove it and open it by hand to see if you get heat.Well hope this helped.

Jan 20, 2010 | 1993 Chevrolet K1500

1 Answer

HEATER BLOWS COLD AIR.REPLACED THERMOSTATE.STIL BLOWS COLD AIR.


check ur passanger side floor board. u may have a heater core out. if that's not out then u have a leak somewhere.

Dec 23, 2009 | 1991 Cadillac DeVille

2 Answers

I have a 2000 Ford Taurus that has no heat. The heater core and thermostate have been replaced yet the air blowing from my vents is cold.


Please check your control valve it is operates on vaccum to pull the valve open,and it will before your heater core, most likey it will be under the dash,

Aug 26, 2009 | 2000 Ford Taurus

1 Answer

1986 VW Golf heater blows cold air


The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.
if the car is not overheating, the thermostat is working fine.... replace or flush the heater core multiple times to try and eliminate sediment build-up.

Jan 14, 2009 | 1986 Volkswagen Golf

Not finding what you are looking for?
1998 GMC Safari Logo

159 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

75066 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...