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  #1  
Old 09-17-2010, 06:43 AM
f4istunter f4istunter is offline
yello
 
Join Date: Jul 2010
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Default no heat

what else could it be i have no heat i am going to put a new thermostat in tomorrow the blower motor works just fine
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  #2  
Old 09-17-2010, 08:06 AM
FireRanger FireRanger is offline
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Default Re: no heat

Several things. Don't just throw parts and money at it and hope it works.

The thermostat should be replaced only if the engine isn't warming up. A t-stat that is stuck open will result in the engine not warming up, evident by the gauge reading very low and as a result you will have no heat. If the gauge is reading normal, replacing a perfectly fine thermostat will not do anything.

There is a valve on the hot water hose leading to the heater core. This valve is vacuum operated. A spring keeps it normally open. When you set the HVAC control for MAX AC or OFF, this valve will close off the flow of hot water. With the HVAC control in some other setting and the engine warmed up, both hoses should be hot. This indicates the valve is working properly and hot water is flowing. If the return hose remains cold, then your valve is stuck closed. Check the vacuum lines and electric connections leading to it for obvious brokenness. A new valve is cheap and easy. If the valve is operating, and coolant is still not flowing, you either are low on coolant or the heater core is clogged.

The blend door under the dash controls the air flow to the heater core. There is an electric servo that operates this door and it is controlled by the temperature knob on the dash. It is accessible through the glove box oriface once your remove the glove box. Check the electrical wiring to make sure it isn't damaged to unplugged. If you are turning the temperature knob and the actuator just sits there looking dumb, it is probably toast and needs to be replaced. Like the valve, it is cheap and easy.
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  #3  
Old 09-17-2010, 08:59 AM
f4istunter f4istunter is offline
yello
 
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Default Re: no heat

yeah the engine is not warming up its staying cold pretty sure the t stat is stuck open
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Old 09-17-2010, 09:13 AM
FireRanger FireRanger is offline
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Default Re: no heat

Then your problem is the thermostat. You do not have a heat problem. Just a stuck thermostat. There is nothing else that would cause that.
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FireRanger
2003 Edge 4.0 4wd

How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide
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  #5  
Old 09-17-2010, 11:02 AM
f4istunter f4istunter is offline
yello
 
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Posts: 74
Default Re: no heat

thanks brahh was gonna put a new one in anyway they are cheap and winter is cold and long in wisconsin
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  #6  
Old 09-19-2010, 07:28 AM
f4istunter f4istunter is offline
yello
 
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Default Re: no heat

hey man i put the new t stat in and i still have no heat the t stat was stuck open or shut what else could it be
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  #7  
Old 12-15-2011, 01:59 AM
O3SuperCrew O3SuperCrew is offline
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Default Re: no heat

Bringing up an old thread here. Just bought a 98 Ranger for my 15 y/o daughter for Christmas and the truck doesn't warm up properly and no heat.

Thanks for the info on the thermostat. I"m going to replace it to see if that fixes it. I know the blend door actuator motor is working so that's not the problem.

RH
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