Is it my thormasthat or water pump going out
Mar 1, 2010 at 10:08 AM
1992 Ford Thunderbird getting cold then hot then cold
1992 FORD THUNDERBIRD
JERRYLINE
- MEMBER
- 2 POSTS
Advertisement
MERLIN2021
- ✓ASE Certified Mechanic
- 17,250 POSTS
Heater Core — Plugged
WARNING: The heater core inlet hose will become too hot to handle if the system is working correctly.
Check to see that the engine coolant is at the correct level.
Start the engine and turn on the heater.
When the engine coolant reaches operating temperature, feel the heater core inlet and outlet hose to see if they are hot.
If the inlet hose is not hot:
the thermostat is not working correctly.
If the outlet hose is not hot:
the heater core may have an air pocket.
the heater core may be restricted or plugged.
If both are hot, the temperature blend door in the heater plenum may be broken or stuck...
WARNING: The heater core inlet hose will become too hot to handle if the system is working correctly.
Check to see that the engine coolant is at the correct level.
Start the engine and turn on the heater.
When the engine coolant reaches operating temperature, feel the heater core inlet and outlet hose to see if they are hot.
If the inlet hose is not hot:
the thermostat is not working correctly.
If the outlet hose is not hot:
the heater core may have an air pocket.
the heater core may be restricted or plugged.
If both are hot, the temperature blend door in the heater plenum may be broken or stuck...
Mar 1, 2010 at 11:09 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.