Question about 1993 Jeep Wrangler

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1993 Jeep Wrangler heater/temperture gauge

My heater seems to blow cool air and I get no reading on my temperature gauge. Also, there is a tremendous draft behind the dashboard/steering column area. Suggestions?

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If you are not showing a temp. reading ,you may need to replace the thermostat. as far as the draft goes your vent is probably stuck open. i also have a '93 with the same issue. i could not adjust the cable enough to close the vent so i removed the grill on the cowl in front of the windshield, the vent door is down and toward the left side (drivers side).if you can not push it closed to stay,i used a large piece of foam placed inside a plastic bag to block it. it has worked fine for almost 5 years.

Posted on Jan 19, 2009

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Could be the heater bypass valve is stuck or the heater core is blocked.
I'd check the heater core first.You may have trapped air in the cooling system or the heater core may be partially plugged up. Engine coolant is delivered to the heater core through two heater hoses. With the engine idling at normal operating temperature, set the temperature control knob in the full hot position, the mode control switch knob in the floor heat position, and the blower motor switch knob in the highest speed position. Using a test thermometer, check the temperature of the air being discharged at the HVAC housing floor outlets.
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Minimum Air Temperature at Floor Outlet 52.2° C (126° F) 56.1° C (133° F) 59.4° C (139° F) 62.2° C (144° F)
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OBSTRUCTED COOLANT FLOW
Possible locations or causes of obstructed coolant flow: Pinched or kinked heater hoses. Improper heater hose routing. Plugged heater hoses or supply and return ports at the cooling system connections. A plugged heater core. If proper coolant flow through the cooling system is verified, and heater outlet air temperature is still low, a mechanical problem may exist.
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Possible locations or causes of insufficient heat: An obstructed cowl air intake. Obstructed heater system outlets. A blend door not functioning properly.
TEMPERATURE CONTROL
If the heater outlet air temperature cannot be adjusted with the temperature control knob on the A/C Heater control panel, the following could require service: The A/C Heater control. The blend door actuator.
The blend door. Improper engine coolant temperature

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