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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

'95 Ford Escort, Great A/C No Heat

Q: I bought a ‘95 Ford Escort LX 4dr for my daughter. The AC works great. The problem is the heater blows but never gets warm. Any clues? How do we fix it?

- William

A: There are a few possible causes that come to mind for your no heat condition. The first check you have to make is to prove that the cooling system is warming to the correct operating temperature. It is not uncommon for a failing thermostat (one that is opening too soon or stuck open) to cause the coolant and engine to operate at a low temperature. This reduces gas mileage and the heat from the heater. If the thermostat proves to be operating correctly then the flow of coolant to and from the heater core should be checked. A quick, but not perfect test is to check the temperature of the coolant hoses to and from the heater core. A restricted or plugged heater core will cause one of the coolant hoses to be markedly cooler than the other. A restricted or plugged heater core is not uncommon on a vehicle of your age. If the heater proves to be restricted be sure to have the cooling system flushed. The passages in heater cores are very small and a poorly maintained cooling system is sure fire to plug these passages. We’ve seen brand new heater cores plugged just as bad as the old ones because of contaminated cooling systems. Last, but possible, is a control problem inside the heater box. There are doors that are used to blend and direct the air. If one of these blend doors is not operating correctly your heating system would only be a cooling system.

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