Mazda B3000 DS, Not really getting hot air from heater and the engine keeps wanting to overheat. HVAC system. 2002.

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Customer: Mazda B3000 DS, Not really getting hot air from heater and the engine keeps wanting to overheat. HVAC system
Mechanic's Assistant: It sounds frustrating to deal with heating issues, especially in the cold. Can you tell me the year of your Mazda B3000 DS?
Customer: 2002
Mechanic's Assistant: Thank you for that information. Have you noticed any leaking from the radiator or unusual noises from the engine?
Customer: no
Mechanic's Assistant: OK. Thanks for the info. The Mazda Mechanic can help with your 2002 Mazda B3000 DS heating and engine overheating issues. And, how would you like to connect with the Mechanic - phone call or online chat?
Customer: online
Answered by RiopH in 5 mins 4 weeks ago
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Hello, my name is ***** ***** I’m an automotive expert here. I'd be happy to help with this today. Who am I speaking with?

Customer
Hi Rio, My name is Jeremiah

Hello jeremiah, nice to chat with you. Tell me about the overheating symptom? How does that play out? What have you done or tested so far?

Customer
the truck will come to temp. When I am driving consistently, the gauge rises and falls, but the highs are higher than previously. if I park or am stopped, the temp will almost go to red and drop when I run engine at higher RPM. at the same time, I am barely getting warm air out of the heater with it turned all the way up.

That would be consistent with having air in the system. A portion of the system is unable to hold pressure and leaking coolant or allowing air into the system. A check would be done with a pressure tester gauge to see if it can hold 18-20 psi without dropping down. Dye can be used to help look for the leak

Customer
ok. another detail to consider, it started after a car wash. and the outside temps have been in the 20's and lower

I doubt that the car wash is connected. Maybe the outside temps. Testing would start by looking for the leak.

Customer
got it. I brought it up because it started after that. Thanks.
Customer
also the coolant level is normal

You want to check it with a pressure gauge to see if it can hold pressure.

Customer
ok

If the system does hold pressure, then testing would move towards temperature flow/control through the system. This is done using an infared temperature gun to check the temperature at various points and compare it to what it should be. It is possible that you have a thermostat issue. Let me know what you find and if you have any other questions when you get into it.

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