Question about 1994 Chevrolet C1500

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Little or no heat from heater

Anti freeze level is good, thermostat just replaced. What is the next thing I should check to get some heat from the heater? Is there a free diagram available somewhere on the internet?

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  • Dan Holzman
    Dan Holzman Jan 04, 2009

    Turned out to be the thermostat I put into it was also a bad one. Thanks for the help guys. Dan

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  • 152 Answers

It is your heater core which is located on most cars under the pasenger side dash board and is hard to replace

Posted on Jan 01, 2009

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Posted on Jan 02, 2017

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2 Answers

Replaced thermostat in 2001 dodgecaravan - heat stays on 2 minutes & then turns cold


you may have a air pocket and it needs to be bleed. check and see if both heater core hoses are getting hot

Dec 07, 2012 | 2001 Dodge Grand Caravan

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What could make a 2002 ford taurus over heat


replace thermostat and bleed air from cooling system

Jul 23, 2012 | 1996 Ford Taurus

1 Answer

No heat


A no heat concern can be caused by several things. First check the coolant level. You will see a cold fill level and a hot fill level on the expansion tank. Be sure that the level is correct. Next, with the vehicle at operating temperature, feel the coolant hoses going into the heater core at the firewall. One should be hot and they other should be close to the same temp. Use caution, the exhaust manifold is close to these lines. If you have heat at the heater hoses then chances are your thermostat is working correctly. If no heat at the heater hoses, you could have a thermostat that's stuck in the open position.

If there is heat on only one side of the heater core, the core is plugged which is common on this year Sable/Taurus. I've had luck removing the heater hoses (careful not to damage the core tubes) and backwashing with a garden hose. Be sure to recycle any anti-freeze. You will see obvious debris/sludge. Reassemble and check for heat, being sure to purge all air from cooling system.

If there is heat on both sides of the core, the concern is inside and more detailed diagnosis is needed. Good luck.

Apr 09, 2011 | 2000 Mercury Sable

1 Answer

Car is running hot had a recent radiator change, the top and bottom hoses are very hard and hot ! could this be the thermostat stuck closed?


Check your coolant level. It may be low.
Did they put the proper mixture of anti-freeze back in? I would have the anti-freeze checked. Or you can buy a simple little tool for a few bucks and do it yourself.

A radiator hose is supposed to be "hard" to withstand the heat. If hoses become soft it is time to replace them.

I don't know enough about Mercedes to answer your question much further other than to suggest the thermostat. If they put in a new radiator, they should have suggested putting in a new thermostat also, but they don't always do that.

Check your anti-freeze mixture first.

Simple things first.

Feb 14, 2011 | 1998 Mercedes-Benz M-Class

1 Answer

Engine warms well, heater fan blowing well, but very little heat comes into cab


It could be one of two things.
1. Bad thermostat. Your thermostat is pobably not opening when the engine warms up. Install a new thermostat and you should be OUT OF THE COLD. If not,
2. Your heating core and radiator is probably clogged. One way to solve this is. Flush out your radiator with radiator flush kit. Pease read your owners manual, (YOU NEED TO USE A SPECIAL TYPE OF ANTI FREEZE). If you use the the green color Presotne anti freeze, It will gradually corrode through the linings of your radiator. And the green color prestone anti freeze will blow out the radiator. So read your owners malual ( I beleive it says you have to use Dextron Anti Freeze ( Pink Color).. Replace your thermostat and flush out your radiator. Then refill your radiator with dextron anti freeze. Also make sure the anti freeze resivor is filled to the proper level.. Once you do all of this, YOU DEFFINITLY WILL BE IN HEAT.. YOU CAN DO THIS YOUR SELF ( iT WOULD TAKE ME NO MORE THAN 1 TO 2 HOURSFOR ME TO DO THIS IN MY DRIVEWAY) OR YOU CAN HAVE THIS DONE AT ANY QUICK LUBE LOCATIONS... HAPPY MOTORING

Jan 06, 2011 | 2003 GMC Sonoma Extended Cab

1 Answer

No heat when van is runing but bewfor eveything works fine


Check you coolant level! If the level is good you may have a stuck thermostat which is available at you local parts store. Some of these are easy to replace and some are a bear. You also may want to check you coolant to see if you have the proper mixture of anti-freeze. If you have too little anti-freeze in your system it may be freezing up.

Dec 14, 2010 | 2001 Chrysler Town & Country

2 Answers

Temp drops, heater cools


Sounds like the typical symptom for a failed thermostat which is stuck open.
After the car has operated for a while, check the rubber radiator hoses; if they are not hot and hotter, the thermostat needs replacement.

Nov 30, 2009 | 1999 Ford Taurus

2 Answers

No heat while idling


Check the radiator, top it off with anti freeze. If it's low then you will most likely have a bad radiator cap or hose going to the overflow tank. If the Antifreeze is ok then the next thing to check is for a vachumm leak, you have no vachum at idle and you should have vachum at highest level. So check the fluid level first.

Aug 25, 2009 | 2004 Nissan Maxima

1 Answer

No heat


HEATER CONTROL VALVE IS NEXT.ARE YOU SURE THE ANTI FREEZE IS UP TO LEVEL WHEN THE TRUCK IS WARM.

Jan 24, 2009 | 1998 Ford F150 Regular Cab

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